I want to do bulk changes for many test cases (issuetype = Test) & these Test are linked to Test Set & Test Plan.
Please share JQL for searching all Test related to a Test Set & Test Plan.
I think you should use JQL queries specific to XRay.
If you are using XRay Cloud "No specific JQL functions are provided, since Jira Cloud does not provide a mechanism to implement them." So I don't think you can do what you want.
Otherwise, if you are using XRay Server, this page should help you ( https://confluence.xpand-it.com/display/public/XRAY/Xray+Documentation+Home?key=XRAY) and a JLQ query like
issue in testPlanTests("SPECIFICTESTPLAN-123")
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