In principle, there is nothing that would prevent you from configuring your DHCPv6 server to return an encapsulated IPv4 address, but as various people have said, this might produce a not-useful result.
I think that the idea of having a DNS resolver priority list is a reasonable answer to the problem of "what do we do if we have both IPv4 and IPv6 addresses for resolvers," but I also think that it's a complicated answer, and I do not believe that the problem it solves is a compelling one. It adds significant special-case code to the DHCP client, and I don't think it produces a useful benefit.
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