@sigiken
What specific data do you need?
If it's only play counts and last played, it should be supported directly if they are saved to the file tags. If it's only stored in the database, you need to import it using SQL commands, if Mediamonkey uses sqlite3, it should be possible to attach both databases and import it using a single sql UPDATE command, you can use the following as reference (https://wiki.strawberrymusicplayer.org/wiki/Import_collection_library_and_playlists_from_Clementine), but you need to use UPDATE instead of INSERT.