Hope you are having a good day!
To create a filter to search for all non-resolved tickets that you are currrently a watcher you can use the Advanced searching and use the following JQL:
watcher = currentUser() AND resolution is EMPTY
After that, you can click the Save as link above the search results to save the filter.
Additionally, I strongly recommend you checking both documentations below about advanced searching and saving filters:
Hope that helps, Violet!
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