There are programs that convert MIDI to ABC but they can't ever do a very good job - you will always need to edit. With luck the barlines might be in the right places, but:

- the beaming and phrasemarks will be random

- the default note length might not be the most readable one

- the key signatures will get the mode wrong for all but major keys

- you will have to spot repeats and put in repeat constructs yourself

- you will have to write in all the metadata, like who the transcriber is and where the tune comes from.