Take a look at the NextDNS service (https://nextdns.io). I connect to it from Unbound using DNS over TLS. Works great for me and doesn't require a separate plugin (though an agent is available as well). If you decide to try it out with Unbound, make sure to disable DNS rebinding checks in OPNsense if you set it to return 0.0.0.0 for blocked sites.
the solution pointed to so far is to use AdguardHome and there is a plugin for it, so yes.If you mean, is there a "something" like a plugin that puts the configuration of the two or three parts in opn that make the whole as well work well i.e. changing the port for unbound, etc. the no.But maybe I misunderstand what you mean.
Do you know why this isn't an "official" plugin in the repository?