Option to prioritize IPv6 for dual-stack (IPv4/IPv6) Upstream DNS hostnames

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Prerequisites

• I have checked the Wiki and Discussions and found no answer

• I have searched other issues and found no duplicates

• I want to request a feature or enhancement and not ask a question

The problem

Currently, when configuring Upstream DNS servers in AdGuard Home using a hostname (e.g., dns.example.com), if the hostname has both IPv4 and IPv6 addresses (dual-stack), AdGuard Home appears to prioritize IPv4 for the connection. There is currently no option to force or prioritize IPv6 for these upstream connections.

Proposed solution

I would like to see an option in the DNS Settings to:

Prefer IPv6: If an upstream hostname resolves to both, use IPv6 first.

IPv6 Only: Only connect via IPv6 if available.

Global or Per-Upstream Toggle: Ideally, a way to specify this preference either globally or by appending a tag to the upstream string (e.g., [/example.com/]tls://dns.google#ipv6_first).

Alternatives considered and additional information

No response