Hi @LI Wang and welcome to the Community,
To retrieve a list of issues you are (currently) watching, you can use the following JQL:
watcher = currentUser()
Retrieving a list of issues you have watched before but aren't watching anymore is not possible as the watcher field does not support history searches in JQL.
The planned version of an issue should be filled out in the fixVersion field if you adhere to best practices. If you do so, then that's where you can retrieve that information.
Jira also has the affectedVersion field available. It uses the same list of releases, but is designed to indicate versions where a certain bug or incident has been identified as opposed to the fixVersion, where you actually (intend to) implement the solution.
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