The JQL function "membersOf" is valid only when used with the user Groups.

Issue Summary

Currently, the JQL function "membersOf" is valid only when used with the user groups. It should be possible to search for the users belonging to a "Team" (People section) using this function. 

This would be useful while configuring automation that searches for users who are part of a Team. 

Workaround

The workaround for this would be to create a Group with the same members of the Team and add that Group in the JQL while configuring the Automation.