Agent Signature based on ticket channel

Hi Community,

 

I’m trying to set an agent signature based on the channel that the ticket came from.

 

I know that there’s no way to check for channels with Liquid Markup, but I was hoping there would be a way to look if certain ticket fields are filled in. I would set these ticket fields via triggers beforehand.

 

This is the code I tried to use without any luck:

 

 

I also tried looking for tags but had no luck with that either.

 

Is it that the Liquid Markup cannot look for ticket data in the agent signature?