TestOps integrate with RedMine

is it possible for defects in testops to integrate with redmine? or only integrate with Jira

Whatever have a certain API can be integrated with Katalon.
You can develop a test listener to create/update redmine issues based on the test case status, by sending RESTfull calls.
see for reference:

Yes, Katalon integrate with RedMine, but in TestOps will appear the defect?