tetele used to maintain an ESPHome config for the Onju Voice but you should be aware that the original Onju Voice uses an outdated hardware design so performance/experience is not good:
FYI, slightly off-topic but hope it is OK that I post a post link to this other thread for discussion possibility of someone created new/updated “Onju Voice” circuit board open.source designs for drop-in PCB replacement for existing Google Nest Mini and Google Home Mini speakers as think could be of interest to same people who are looking for this type hardware solution: