  Let $\omega$ be a closed, non-degenerate differential form of arbitrary
degree. Associated to it there are an $L_{\infty}$-algebra of observables, and
an $L_{\infty}$-algebra of sections of the higher Courant algebroid twisted by
$\omega$. Our main result is the existence of an $L_{\infty}$-embedding of the
former into the latter. We display explicit formulae for the embedding,
involving the Bernoulli numbers. When $\omega$ is an integral symplectic form,
the embedding can be realized geometrically via the prequantization
construction, and when $\omega$ is a 3-form the embedding was found by Rogers
in 2010. Further, in the presence of homotopy moment maps, we show that the
embedding is compatible with gauge transformations.
