Special function @bindertitle?

I’m looking for a way to refer to the title of the document in a binder that is marked as the main body text. I took a look at the special function @doctitle, but this function refers to the title of the subdocument. Is there any way to refer to the title of another subdocument? You could make use of a cross-tag, but (1) I don’t need a hyperlink in this specific case and (2) this would result in an error if the clause is not in a binder. Of course, creating the special function @bindertitle would result in an error if the clause is not used in a binder. In that case, I think it can just act as if it was a @doctitle.

Edit: actually, I’m wondering whether this new special function @bindertitle would be the solution, because I’ll need to make the binder titel dynamic (so it should be a clause in title formatting instead of the title itself).