Scripting Help to Add a Mention



I have a webhook for iTop. Basically, whenever a user support request comes in, it goes to a Rocket.Chat channel. Someone will then assign that request and it too will go to the channel. Here is an example of a message:

Title: Monitor Screen
User: User Name
Assigned To: Tech Name
Status: assigned

What I would like is to add a script to the webhook to identify “Tech Name” and mention that user, add @techname

Is that possible? Is that crazy? Any chance it is relatively easy enough to tell me how?