Calculate known morphs by language (or note type, or deck)

[szalejot]

Is your feature request related to a problem?

I am studying multiple languages in Anki. Currently add-on shows only sum of all known morphs for the whole collection.

Describe the solution you would like

Calculate known morphs by language, or note type, or deck. Generally provide a way to calculate known morphs only for the selected part of the collection.