The internal sequencer does not run on midi it is elektrons proprietary system so all the flashing and what not doesn’t correlate to any midi information.
That being said I’m sure that it could be impliment like the other machines to send midi note data (not sure if they output audio when they are being used for midi though). But I would say it’s not likely because there already 8 midi tracks on the digitakt and if you want just the note data the workaround is copy an audio tracks notes and paste it to a midi track.