Joyce's natural morphism conjecture for oriented Lagrangian morphisms

Let $X$ be a $(-1)$-shifted symplectic stack and let $f\colon L\rightarrow X$ be a Lagrangian morphism. Assume that both $X$ and $L\rightarrow X$ are equipped with orientation data.

Joyce's conjecture. There is a natural morphism

$$\mu_L\colon \mathbf{Q}_{t_0(L)}[\dim L]\longrightarrow f^!\phi_X.$$

This conjecture, attributed to Joyce, proposes the morphism needed to define the sheaf-theoretic Lagrangian contribution associated with oriented $(-1)$-shifted symplectic geometry. The supplied passage does not state whether the conjecture has been resolved.