User Permissions - Quick Stock Balance

In Quick Stock Balance doctype, I have been trying to limit access to the stock value field without modifying the core doctype. I tried customize form, Role Permission Manager and Role Permission for Page and Report but this doctype does not show.

At the moment I cannot think of any other way other than using developer mode and edit the doctype to restrict the field view.

Is there no way to customize standard single page doctypes?

I don’t think Quick Stock Balance is a single doctype, rather it is a page afaik.

I thought the same but its a single doctype check screenshot