Pattern for adding information to a request that was submitted

I'm designing a flow for an approver. It is a relatively complex problem.

Requestors can submit requests which go to an approver to approve.

The approver needs to be able to see the details of the request coming in and in addition they can add some details to the request that the requestor did not have. After this, they can officially "Approve" the request.

Curious if anyone knows of a pattern for mixing editable & non-editable information into one area. For e.g. DocuSign has sign-able fields and information for a contract. Would love some help to brainstorm