Hi
For email you just add a ; separated list like
email1; email2; email3; email4
If you have to have a random number of approvers, then its up to you to set up something either in SharePoint or Dataverse, something that the flow can look at to know which people to email.
That or you have to hard code a Switch statement that you would configure with hardcoded emails or again, configuration stored somewhere, even in environment variables
Walkthrough
Imagine that you could identify documents with an attribute like Approval Type
And imagine its just a number 1,2,3,4
So you create a SharePoint list like this.
Approval Document Types
Column (Document Type Id), Column (Document Type Description), Column (Document Approvers)
Now lets say you have the following data
1, My Single Approver Type, matm.com;
2, My Double Approver Type, matm.com, cat.com
3. My Triple Approver Type, matm.com, cat.com, that.com
Ok, now when a document comes into your Flow, you would somehow have to tell what kind it is.
Then use the Type, and do a Get Items in SharePoint list, to grab the row that is either 1, 2 or 3 in the Document Type Id Column
Once you do that, you can grab the Document Approvers column, which is the ; separate list of approvers, which you can change in real--time
Thats an example of how you can do it.