Website seems to not yet document the Sec-Ch-Prefers headers (e.g. sec-ch-prefers-color-scheme).
Website does already document the relevant media queries, but not these headers.

Chromium-based browsers have it since v93 (including chromium android).
Webview also has it since v93.
Firefox and Safari not yet.
Not sure about opera. Given opera supports other client headers I imagine it does support so,
but do not find any info about it.