In modern home labs and small networks, it is common to operate multiple VLANs or subnets routed through a single gateway. While Pi-hole supports acting as a DHCP server, it is currently limited to a single DHCP scope and does not support multiple scopes per instance, which restricts its usability in segmented network environments. Can Pi-hole be enhanced to support multiple DHCP scopes?
If DNSMasqd which is used for FTLDNS can do it then you can do it by adding the right config lines/options to the right config files.
Since the release of Pi-Hole v6 it even binds by default to all my VLAN Interfaces so adding the DHCP Scopes to those is now even less effort than it was before! 
I don’t use Pi-Hole for DHCP but I am 100% sure it can be done after reading a bit of documentation @ Man page of DNSMASQ
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Indeed Pi-hole already supports this by dnsmasq tagging the network interface(s):
You can add those three dnsmasq directives per interface via the webGUI:
Settings > System > flip Basic to Expert > All Settings > Miscellaneous > misc.dnsmasq_lines
Or use the misc.etc_dnsmasq_d setting on that same page.
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