There’s a fairly elaborate (if perhaps pretty unfriendly) partial schematic/diagram document on github that has a front panel connector on page 14 if I’m not mistaken.
It’s kind of alarming that there doesn’t seem to be a plain simple manual on the product page. At least I couldn’t find one either. There’s some compliance manual “coming soon” but otherwise nothing that matches the word “manual”. You’d kind of expect that to be the first thing to be on any product info or support page. (That or a datasheet, depending on context.)