Customized welcome message in Jira Service Desk portal

[Andrei]

Hello.

I would like to configure Jira Service Desk so that when a user (say John Doe) logs in he would see Hello John on the portal page. Is this possible somehow? I have JIRA v7.5.2.

Thanks.

Andrei.

[Daniel Scott]

I got Welcome $username to work but it returns John.Doe and I can't seem to find a variable for first name only. I will keep looking.

[Kian Stack Mumo Systems]

Andrei, 

I've never heard of anything like that. I'm also not seeing anything promising when searching the marketplace. Perhaps someone knows something more, but I'm not seeing anything that would do it for you short of modifying the source code or creating your own plugin to perform this. 

Thanks, 

Kian