Jira cloud jql for identifying tests in a test set (to replace testSetTests)

[Bobby Reeves]

My organization is migrating from Jira server with the Xray add-on to Jira cloud with Xray. In doing so, we are losing the ability to use certain Xray functions on the cloud so we are having to rewrite queries using these functions. 

To identify test cases that have been associated with a test set, we would use the following query using the Xray function:

• issue in testSetTests (key ID of test set or “filter name”)

This will not work on the cloud. 

Is there a suitable jql substitution to use on the cloud that will return test cases of a test set?