proposal_id is the unique ID of a proposal.
voter is a proposal voter account address.
curl -L \ --url 'https://tia-rest.nownodes.io/cosmos/group/v1/vote_by_proposal_voter/{proposal_id}/{voter}'
{ "vote": { "proposal_id": "text", "voter": "text", "option": "VOTE_OPTION_UNSPECIFIED", "metadata": "text", "submit_time": "2025-04-06T02:19:09.727Z" } }