User-defined attribute Manage Supplier Spend Authorization Approvals

Summary

Where can I set up user defined attributes for Manage Supplier Spend Authorization Approvals?

Content

Where can I set up user defined attributes for Manage Supplier Spend Authorization Approvals? For other approval pages I have seen a Manage User-define attributes options. But I am not able to find that for Suppler Spend Authorization approvals. Thank you! 

Version

21C