Perhaps not that satisfying answer since i dont have remedy and cannot put it all together.
Here is a small java program you can use.
You'd need to replace the args passed in into the values of each newEntry line. Take args to args[n] and replace in each of the newEntry lines:
newEntry.put(1000000163, new Value(4000)); // Impact - (High) 1000/2000/3000/4000 (Low)
Then you can hook it up using the following mechanism - replacing the generateRemedyTicket script with the java code.
If this is not clear let me know and i could get it closer by cleaning up the java code.
Also on the net there is VB code to do the same.
FWIW, we do have code to create Jira tickets - we are a jira shop here at splunk.