@chapelierfou probably simplest way is something like this:
https://www.hobbytronics.co.uk/midi-breakout?utm_source=google&utm_medium=googleshopping&utm_campaign=googlebase&gclid=Cj0KCQiA7qP9BRCLARIsABDaZzgOw0_95aL3z-PrfhJP8XMIK6C7Ju9L5f6j6livQ1wWDPUUsA7i2CMaAswVEALw_wcB
Or any 3.3v compatible midi breakout, then just connect to +v supply, gnd, tx, rx on akso according to this:
“ Traditional MIDI DIN is also supported at test points but requires a breakout board or adapter. Starting from the voltage in pin VI and working down, the test points align with the five pin connector on Axoloti Core’s MIDI section, so it can be reused if you have one available. MIDI RX is mapped to pin G9 . MIDI TX is mapped to pin GE .”