Just to clarify. You said you have a flow for emails, which I assume are approvers.
However, can I ask where does the decision get made WHO will be part of that list? You cannot have a visual list in Power Automate
So you can do a couple things
1) have a configuration table/list/excel file in the back
2) have an approval type or document type in your list
3) pass the "Type" to the flow
4) the flow can then do a lookup for approvers in SharePoint or Excel
This is different from
@hugojesus (which could be used also), in that I do not know from your details, does this all happen when someone "submits" a document and then it triggers approvals?
My point to this is, do you want people who are submitting to select approvers or have the Approval process determine automatically who the approvers are, hence my suggestion.
I really suggest SharePoint as its free and easily changable where-as Excel can be problematic and Dataverse is overkill.
So are you using SharePoint forms or just triggering on Save into SharePoint?