Let $X$ be a locally Noetherian scheme and $K^{\bullet}$ a perfect complex of $\mathcal{O}_X$-modules. We say $K^{\bullet}$ is "formal" if it is quasi-isomorphic to the complex $\bigoplus_{n}H_n(K^{\bullet})[n]$.
Can formality of a perfect complex of $\mathcal{O}_X$-modules be checked Zariski-locally on $X$?
Remark. This seems dubious to me, unless there's some natural zigzag between $K^{\bullet}$ and $\bigoplus_nH_n(K^{\bullet})[n]$, in which case it'd be better to define formality in terms of that map in $D(\mathcal{O}_X)$ being an isomorphism. But maybe there's a procedure to build a formal representatives out of local data and I'm just unaware of it.
I'd be interested to know if it's possible. A quick literature search didn't turn up much.