Match string to user in automation

[steven.baron]

I have an MS Flow creating a ticket in Jira. It passes a user's first and last name as a string. How do I match that so I can assign them as a requested participant? 

Flow's create issue action doesn't support any fields that are not basic string inputs.

Possible solution;

Can I like somehow make a web request to 

/rest/api/3/user/search?query='

 in the automation itself?

[steven.baron]

:(