How to enable DNS-over-HTTPS (DoH)

Description of the issue:
How to enable DNS-over-HTTPS (DoH) .
I found no flag ‘dns-over-https’.

**Steps to Reproduce (add as many as necessary)

  1. start brave
  2. URL brave://flags

Actual Result (gifs and screenshots are welcome!):

Expected result:
flag ‘dns-over-https’.
Reproduces how often:
allways
Operating System and Brave Version(See the About Brave page in the main menu):

Additional Information:

Interesting, I get the flag for the same version:

Do you see it in the “Unavailable” tab?

I don’t see the flag ‘Secure DNS lookups’.
This flag is also missing on Chrome, Chromium and Vivaldi.
Only Opera has this flag.

Chrome/Chromium definitely added this flag with v78 at the beginning of September, see https://www.chromium.org/developers/dns-over-https

And as my screenshot proves, Brave also inherited it by upgrading to v78 of Chromium.

Why it is not shown on some setups I do not know, it might have to do something with the OS.