I'd like to suggest a new feature that allows users to not only create new filters from various points within an email, but also to extend existing filters with new conditions.
This should definitely be implemented because there's a tendency to create a new filter for every email sender and subject.
For example, Facebook sends emails from 4-8 different email addresses, but all should go into the "Facebook" folder. In this case, it makes sense to have an option in the context menu of the received email not only to create a new filter, but also to extend an existing email filter.
There could be a small intermediate window where users can select the existing email filter (this is useful when there are many email filters), instead of just the context menu -> "Email Filter A, Email Filter B, etc." It's important that the selected parameters, such as "Sender" or "Subject," are remembered in this intermediate window so they can be added to an existing email filter.
This suggestion helps to automatically keep your email filters more organized.