How to pass a variable in a JSON string in bash script

i have below script while gets some command output from a host and keeps that into a file /tmp/${stcl}_aggr.txt, further this file is placed to a variable body=$(cat /tmp/${stcl}_aggr.txt)

While calling this Variable body into a Jason arrays as "description": "$body" its value is not getting expanded and resulting in error as KeyError: 'result', and the varible like incident_number, curloutput also not working while if i remove that body for "description": then script will run but the i need "description": value to be uploaded.

#!/bin/bash
#
DATE=$(date +"%m_%d_%Y_%H_%M")
mailto="[email protected]"
cwd="/myenv/filer-mgt/bin"
output="/my_env/filer-mgt/rpt/$DATE"
clusters="udcl301 "

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:$PATH
incident=$1
sysid=UNKNOWN

checkvaultenv=`echo $vaultenv | tr '[:upper:]' '[:lower:]'`
if [[  "$checkvaultenv" == "" ]]
then
  vaultenv=prod
else
  if [[  "$checkvaultenv" != "dev" &&  "$checkvaultenv" != "test" && "$checkvaultenv" != "acc" && "$checkvaultenv" != "prod" ]]
  then
    echo unknown vault environment specified: $vaultenv
    exit 1
  fi
fi
vaultenvlc=`echo $vaultenv | tr '[:upper:]' '[:lower:]'`
vaultenvuc=`echo $vaultenv | tr '[:lower:]' '[:upper:]'`


SNOW_USERNAME=`export EDITOR=cat ; ansible-vault edit --vault-password-file=~/.ssh/vpf.iss.${vaultenvlc} ~/iss/vaults/vault-${vaultenvuc}.yml | grep vault_servicenow_username | grep -v -E  "^\s*#" | awk '{print $2}' FS=\"`
SNOW_PASSWORD=`export EDITOR=cat ; ansible-vault edit --vault-password-file=~/.ssh/vpf.iss.${vaultenvlc} ~/iss/vaults/vault-${vaultenvuc}.yml | grep vault_servicenow_password | grep -v -E  "^\s*#" | awk '{print $2}' FS=\"`

case $vaultenvlc in
  ram)
    SNOW_INSTANCE=udc2dev.service-now.com
    ;;
  iqa)
    SNOW_INSTANCE=udc2dev.service-now.com
    ;;
  dev)
    SNOW_INSTANCE=udc2dev.service-now.com
    ;;
  test)
    SNOW_INSTANCE=udc2trn.service-now.com
    ;;
  acc)
    SNOW_INSTANCE=udc2qa.service-now.com
    ;;
  *)
    SNOW_INSTANCE=udc2.service-now.com
    ;;
esac

SNOW_AUTH=`echo -n $SNOW_USERNAME:$SNOW_PASSWORD`

create_incident()
{
  url="https://${SNOW_INSTANCE}/api/now/table/incident"
  curloutput=`curl -sslv1 -u $SNOW_AUTH -X POST -s -H "Accept:application/json" -H "Content-Type:application/json" $url -d "$variables" 2>/dev/null`
  RETURNCODE=$?
  if [ "$RETURNCODE" == "0" ]
  then
    incident_number=`echo $curloutput |  python -c $'import sys, json\nprint json.load(sys.stdin)["result"]["number"]'`
    sysid=`echo $curloutput |  python -c $'import sys, json\nprint json.load(sys.stdin)["result"]["sys_id"]'`
    echo "OK: created incident $incident_number with sysid $sysid"
  else
    echo "ERROR creating incident:"
    echo "======================================="
    echo $curloutput
    echo "======================================="
  fi
}

#create_incident
for udcl in `echo $clusters`
do
  ssh $udcl aggr show -root false | grep -i "9[2-9]%\|100%" >  /tmp/${udcl}_aggr.txt
  snshort_description="aggr utilization above limit"
  sncmdb_ci=$udcl
  body="`cat /tmp/${udcl}_aggr.txt`"

read -r -d '' variables <<- EOM
{
  "short_description": "$snshort_description",
  "assignment_group":  "RD-DI-Infra-Storage",
  "contact_type":      "interface",
  "state":             "New",
  "urgency":           "3 - Low",
  "impact":            "3 - Low",
  "cmdb_ci":           "$sncmdb_ci",
  "u_sec_env":         "Normal Secure",
  "description":       "$body"
}
EOM

echo $variables

  create_incident


ssh $udcl "ro 0;vol show -state offline -fields aggregate"|grep stv > /tmp/${udcl}_validate_offline_volume.txt
done

Error:

i see below error while running the above..

[root@inv0104 tmp]# ./K_storage_healt_check.sh
{ "short_description": "aggr utilization above limit", "assignment_group": "RD-DI-Infra-Storage", "contact_type": "interface", "state": "New", "urgency": "3 - Low""' }mpact": "3 - Low", "cmdb_ci": "udcl301", "u_sec_env": "Normal Secure", "description": '"udc3019_ssd02 93.89TB 6.10TB 93% online 391 udc3019 raid_dp,
Traceback (most recent call last):
  File "<string>", line 2, in <module>
KeyError: 'result'
Traceback (most recent call last):
  File "<string>", line 2, in <module>
KeyError: 'result'

While running in the bebug mode i see more error like..

+ curloutput='{"error":{"detail":"Cannot decode: java.io.StringReader@6b4762","message":"Exception while reading request"},"status":"failure"}'
+ RETURNCODE=0
+ '[' 0 == 0 ']'
++ echo '{"error":{"detail":"Cannot' decode: 'java.io.StringReader@6b4762","message":"Exception' while reading 'request"},"status":"failure"}'
++ python -c 'import sys, json
print json.load(sys.stdin)["result"]["number"]'
Traceback (most recent call last):
  File "<string>", line 2, in <module>
KeyError: 'result'
+ incident_number=
++ echo '{"error":{"detail":"Cannot' decode: 'java.io.StringReader@6b4762","message":"Exception' while reading 'request"},"status":"failure"}'
++ python -c 'import sys, json
print json.load(sys.stdin)["result"]["sys_id"]'
Traceback (most recent call last):
  File "<string>", line 2, in <module>
KeyError: 'result'
+ sysid=
+ echo 'OK: created incident  with sysid '
OK: created incident  with sysid

looks like an issue with json or python which i am unable to get here.

Problematic Section:

 ssh $udcl aggr show -root false | grep -i "9[2-9]%\|100%" >  /tmp/${udcl}_aggr.txt
  body="`cat /tmp/${udcl}_aggr.txt`"

read -r -d '' variables <<- EOM
{
  "description":       "$body"
}
EOM

If i'll remove the $body then whole script will run just fine hence its all about the variable $body which is not getting intrepreted.