So, you're on a government approved setup and can't use Docker containers nor compile a recent Chromium to /opt… but it's perfectly fine to fill it with pirated porn? And people need to run JS porn games on rugged setups placed in hard to reach locations and most probably struggling to run modern day browser to begin with, now too? Interesting.
The feature got deployed with Chrome 76 – as is confirmed by the
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of that version – published on July 30 2019. So 'timely manner' is really stretching it. Also, the document you've linked to, as stated, is only up to date on Chrome's own progress. See
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for details on other browsers support.