@shibai this is far from rude, and far from barging in! i don't know the state of the research on this, but it seems at least in the $n = \infty$ case, there should be an analogue of the gepner--haugseng formalism for enriching in a monoidal (or at least maybe $E_n$ monoidal?) $(\infty,n)$-category. too tired to think through much of this but i'm scared of trying to use un/straightening for $(\infty, n)$-categories; maybe there's something using $\Theta_n$ instead of $\Delta$?