I have yet to accomplish this. You will need to address a few things.
Create a JMS client that receives a JMS message from a JMS Queue, either using a P2P or a Pub/Sub messaging approach. This can be done using the built-in Java functionality of Cloverleaf. You will need to write Java code.
Convert the message content from the JMS publisher to a JSON formatted message. What you convert it to depends on the downstream process that consumes the new JSON-formatted message. Your job is easy if the message you receive is simply a JMS text message in an XML format, and the downstream system wants a JSON representation of that XML.
Here are some ChatGPT prompts that could get you started:
“Write Java code that converts an XML string to a JSON string.”
“Write some sample Java code that creates a JMS subscriber client using the JMS API.”