Concatenate two custom fields

Hello JIRA fam,

I have a small use case for automation and was hoping to get help here. It goes like this:

Trigger - when an issue is transitioned to "Resolved" (just before closing it)

The first condition to move forward - is it a request type to "Request a new email"?

The second condition - is the email field empty? (admin forgets to enter this info before closing which causes another system automation to fail. It is not possible to make this field required for a "specific screen")

Then - set the field to a variable concatenating "FirstName.LastName@workemail.com"

I would like to use the Create Variable action to formulate the missing email in case the admin forgets.

First and Last names are both custom fields.

The email will always have First.Last@workemail format.

Thank you all!

Tony