Hi Chris,
I finally know an answer to to a question! I was able to do this for our call center employees using the [[Agent_Alias]] option. The "Alias" is a section you can add to the personal details section. We were using it to surface preferred names in searches (like Robert vs Bob), but we used it for email signatures as well. I'm not sure if you can add that field to a bulk user import, but it would nice if you could. Here's the basic canned response:
{{AGENT_ALIAS}}
Customer Service Agent
AAA Washington | Corporate Office
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Naila Mendenhall
AAA Washington
Program Manager- Genesys Cloud
nailamendenhall@aaawa.com------------------------------