Need help to fix shell script to convert string to json response

I am trying to convert below string which is stored inside a txt file into json formatted string

High Severity Results: 0
Medium Severity Results: 1
Low Severity Results: 2
Information Severity Results: 0
Scan Results Location: Https://www.checkmarx.abc.com/cxwebclient/viewermain.aspx?scanid=12345&projectid=1234

to below json format

{
"High Severity Results" : "0",
"Medium Severity Results" : "1",
"Low Severity Results" : "2",
"Information Severity Results" : "0",
"Scan Results Location" : "Https://www.checkmarx.abc.com/cxwebclient/viewermain.aspx?scanid=12345&projectid=1234",
}

I tried the below command.

file="Checkmarx_Json_Data.txt"
checkmarxDataNew="$(cat Checkmarx_Json_Data.txt)"
while IFS= read -r line || [[ -n "$line" ]]; do
  for val in $line
  do
    echo "\"${val//:/\":\"}\"" >> ACM_BQ_JSON_Response.json
  done
done < "$file"

but the above script is generating response in below format

"checkmarx" : {
"High"
"Severity"
"Results":""
"0"
"Medium"
"Severity"
"Results":""
"1"
"Low"
"Severity"
"Results":""
"2"
"Information"
"Severity"
"Results":""
"0"
"Scan"
"Results"
"Location":""
"Https":"//www.checkmarx.ford.com/cxwebclient/viewermain.aspx?scanid=2500093&projectid=28069"
}

when I tried with a Single string like color:red, it worked well.

can someone help me to resolve this issue.

Here's how it can be done with jq:

jq --raw-input 'split("\\s*:\\s*"; "") | 
  { (.[0]): (.[1:] | join(":")) }' < input-file | \
jq --slurp add

output:

{
  "High Severity Results": "0",
  "Medium Severity Results": "1",
  "Low Severity Results": "2",
  "Information Severity Results": "0",
  "Scan Results Location": "Https://www.checkmarx.abc.com/cxwebclient/viewermain.aspx?scanid=12345&projectid=1234"
}

Using sed

$ sed -Ee 's/$/,/;1i\{' -e '$a\}' -e 's/^([^:]*)(: )([^,]*)/"" ""/' Checkmarx_Json_Data.txt
{
"High Severity Results" : "0",
"Medium Severity Results" : "1",
"Low Severity Results" : "2",
"Information Severity Results" : "0",
"Scan Results Location" : "Https://www.checkmarx.abc.com/cxwebclient/viewermain.aspx?scanid=12345&projectid=1234",
}

#!/usr/bin/env bash

total_cnt=$(wc -l < Checkmarx_Json_Data.txt)

{
printf {\\n
while IFS= read -r line; do
  col1=${line%%:*}
  col2=${line#*: }
  if ((++line_cnt < total_cnt)); then
    printf '  "%s" : "%s",\n' "$col1" "$col2"
  else
    printf '  "%s" : "%s"\n' "$col1" "$col2"
  fi
done < Checkmarx_Json_Data.txt
printf }
} > ACM_BQ_JSON_Response.json

If ed is available/acceptable, something like:

The script.ed (name it to your own hearts content)

,s/\([^:]*\)\(: \)\(.*\)/  "" ""/
1,$-1s/$/,/
0a
{
.
$a
}
.
,p
Q

Now run:

ed -s Checkmarx_Json_Data.txt < script.ed

To create a new file with the edited output,

ed -s Checkmarx_Json_Data.txt < script.ed > ACM_BQ_JSON_Response.json