Unclear how to send to a reusable recipient group with the rest api?

I inherented a project that is currently working, that currently uses the rest API to send envelopes out to be signed. As of right now, each step in the signature logic is sent to a single individual, so for each step, it generates a memberInfos block with that individual's email - this is all working.

However, for one step, they would now like it to use a signing group. I can see that if you have multiple people that you want any one of to sign for a given step, you can create a participantSetsInfo block with multiple memberInfos assigned the same order, if you just have the emails of each participant. If necessary, I suppose I could do it that way, but if they already created a recipient group, as per https://helpx.adobe.com/sign/config/send-settings/recipient-groups.html - is there any way with the agreements endpoint to point the participantSetsInfo to such a group instead of having to provide it with the email of each group member? I don't see anything obvious in the documentation.

Thanks