I strongly recommend testing it over USB
you need a specific board (i use Pink Faun Bridge)
BUT:
- there is no I2S/Hdmi standard, you need to know the pinout diagram
- you need a specific hdmi cable for audio (and even for your specific Dac)
- the cable should be very very short....let's say 50 cm
- apart from the PF I2S bridge you could spend 60 USD for the cable.....and it is done