Can AGH queries for local clients be made within VPN tunnel?

[ghost]

Is it possible to tunnel AGH DNS queries via VPN tunnel? I run AGH on Raspberry Pi and use AGH exclusively for private local network clients that aren't set up to use VPN, but I can set up VPN tunnel on Raspberry Pi itself. Can I hide upstream queries for local clients by tunneling their DNS queries through VPN tunnel set up in Raspberry Pi?

I fully disable outbound UDP port 53 for WAN on my router and use DoH directly by specifying IP instead of domain name (https://94.140.14.14/dns-query instead of https://dns.adguard.com/dns-query). That way there is no need for plaintext bootstrap DNS queries over UDP port 53 for WAN.

I want the initial query for establishment of connection to VPN to use AGH's DoH and have the rest of queries for AGH itself and local clients to go through VPN tunnel created on Raspberry Pi. Would I have to use split tunneling for that?