I have some custom field from using other music players mapped to my files such as BPM and System but Strawberry doesn't recognize them anywhere. I want to be able to create smart playlists using those tags but there isn't even an custom field to enter your own tags on it

I have some custom field from using other music players mapped to my files such as BPM and System but Strawberry doesn't recognize them anywhere. I want to be able to create smart playlists using those tags but there isn't even an custom field to enter your own tags on it