How to add new fields to the seeded Sales Order Report Data Model

Summary:

We have a requirement to add additional fields: Notes, Return Complaint, Memo, RMA‑Service Order No, RMA‑Notification No, RMA No, Serial Number, etc. to the SalesOrder DataModel.

We have customized the seeded SalesOrder DataModel and Report to the Custom folder at Shared Folders>Custom>Supply Chain Management>Order Management>Sales Order. The DataModel has sample XML file provided and not the SQL query. The XML file does not have the required columns mentioned above.

How can we add additional columns to the Sales Order data model?