How to pre-define Recipient Groups?

Hi All

I have a document (offer to customer) that's generated out of SAP and needs to be signed by 2 people (names can vary based on recipient group). This action is done multiple times per day - how do I pre-define recipient groups? I know how to create one manually but I want to give my users an option to just choose a recipient group I've created for them.

Second question: is it possible to automatically update the recipient group based on Excel from Sharepoint? Probably using Logic Apps?

Answer to any of these 2 questions (even if just one) is highly appreciated!!

Thank you!

Natalia