Description in the Approval email or mandatory Notes

Hello

I am trying to create a clear approval email so managers know why the requester is putting in the request.

Scenario 1:

The Description field is currently used to "find the request later".

I want to add this line in the approval email.  We instruct users to add the why in the description box.

Scenario 2:  

Adding the Notes to the approval email is not a problem.

Question: Can I make the Notes box mandatory in the default request form?

Thank you