See the original feature request in the dnsproxy repo:
https://github.com/AdguardTeam/dnsproxy/issues/44
It is already highly upvoted so I think it makes sense to assign it to a milestone already.
This would be quite problematic to add and I don't see that much desire for this to happen.
There's always DOH/DOT for those who would like encryption.
Okay, not that problematic after all since DNSCrypt support has been added to dnsproxy: https://github.com/AdguardTeam/dnsproxy/commit/39abe8047a59281128fa40ef879061ce25792d66
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Okay, not that problematic after all since DNSCrypt support has been added to dnsproxy: https://github.com/AdguardTeam/dnsproxy/commit/39abe8047a59281128fa40ef879061ce25792d66