It should be available through the rest api:
https://docs.atlassian.com/jira/REST/latest/#d2e4676
{ "self": "http://www.example.com/jira/rest/api/2/user?username=fred", "name": "fred", "emailAddress": "fred@example.com", "avatarUrls": { "24x24": "http://www.example.com/jira/secure/useravatar?size=small&ownerId=fred", "16x16": "http://www.example.com/jira/secure/useravatar?size=xsmall&ownerId=fred", "32x32": "http://www.example.com/jira/secure/useravatar?size=medium&ownerId=fred", "48x48": "http://www.example.com/jira/secure/useravatar?size=large&ownerId=fred" }, "displayName": "Fred F. User", "active": true, "timeZone": "Australia/Sydney", "groups": { "size": 3, "items": [ { "name": "jira-user", "self": "http://www.example.com/jira/rest/api/2/group?groupname=jira-user" }, { "name": "jira-admin", "self": "http://www.example.com/jira/rest/api/2/group?groupname=jira-admin" }, { "name": "important", "self": "http://www.example.com/jira/rest/api/2/group?groupname=important" } ] }, "expand": "groups" }
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