Hey @ADenicoff this currently isn’t possible within the default tasks view as the tasks view doesn’t support multiple objects within it’s filters (tasks and deals).
If you have the custom report builder however you could create a custom report using both the tasks and deals object to display a table of tasks and display any associated deal stages with those tasks, something like this (mine is showing no value as I don’t have associated deals with my demo tasks:
If you wanted to you could then use the report filter to filter only by a specific deal stage if you wished!
Hope this helps!