Journal Approval (spreadsheet) - does it support lookup ?

Summary:

Would like to know if I can use lookup as one of the approval rule logic

Content (required):

Our client is looking to implement journal approval rule in 23B. So using spreadsheet.

I need to create a rule which specifies who approvers are based on journal submitter. Obvious choice is to specify username in spreadsheet.

However I see it is not convenient as the username seem to be case sensitive and the client needs to update the rule every time there is a movement.

Is there an option to use a list similar to Approval Group ? Perhaps Lookup ?

So the rule looks like