This is the documentation of JSU for Jira Cloud. If you are using JSU on Jira Server/Data Center, you can find the documentation here.
The 'User in Field' check will verify that the current user is in the specified field, typically a multi select/user picker custom field.
You must specify the field that is the prerequisite for this transition, and whether the user must be in the field or not, when configuring the check. For example:
A workflow is configured so that the 'Approve' transition has the 'User in Field' check. If the current user is not the specified reviewer, the description will be modified to show who performed the review instead.
Supported Field Types
In its different modules (especially those for workflows), the JSU app supports many different field types. System fields, as well as custom fields.
However you should be aware, that not all field types or all combinations are supported. We think we cover the most important field types and are still continuously adding and improving which, and how different field types are supported. But the one you need might not work (yet).
We recommend that you test JSU with fields to see if it is compatible with your system. Our evaluation license gives you 30 days free trial.