API endpoints for a service desk user picker

I’m creating a custom widget that replicates the service desk functionality in Jira for an intranet. I’m having trouble finding the endpoint to use to get ALL users for a particular user picker field in one of the many user pickers on the forms I’m working with.

This endpoint appears to work when you have a query https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-group-and-user-picker/#api-rest-api-3-groupuserpicker-get

What I need is an endpoint that returns all of the user results for the initial dropdown state. For example, if I need to choose a manager or particular engineer. In the service desk, this is a pre-filtered list of users who seem to be in a particular group.

Is this even possible with the available endpoints? I’m using an oAuth app with user tokens to query the Jira API currently.

There does appear to be an issue with the group and user picker endpoint. They created a public bug ticket: https://jira.atlassian.com/browse/JRACLOUD-93628#

If you pass query=“” it will return users for an empty query.