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:
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

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.