This will almost certainly never get implemented because the community has a more or less accepted workaround. Run more than 1 pi-hole.
It's a common-ish practice in the community to have a restrictive pi-hole running in your guest/kids network and a more permissive pi-hole running in the trusted/adults network. Pi-holes require so few resources and maintenance that it's not much burden to run more than one.
It would be a pretty large feature to support separate blocklists per IP range.
That's what I do, but it's a maintenance burden to run several instances. I run three PiHole VMs: one for parents (banning ads only), one for little kids (banning ads and mature content), and one for teenagers (banning ads and temporarily banning "time drain" sites until homework is done). I'd like to further customize the one for teenagers based on whether or not they have missing homework in school, but not quite to the level of spinning up (and maintaining) yet another instance.
It's a common-ish practice in the community to have a restrictive pi-hole running in your guest/kids network and a more permissive pi-hole running in the trusted/adults network. Pi-holes require so few resources and maintenance that it's not much burden to run more than one.
It would be a pretty large feature to support separate blocklists per IP range.