DNS is what you’re looking for. To keep it simple and in one place (your adguard instance), you can add local dns entries under Filters > DNS Rewrites in the format below:

192.xxx.x.47 plex.yourdomain.xyz
192.xxx.x.53 snapdrop.yourdomain.xyz

What is your root filesystem installed on - lvm, zfs, or bare disk partitions? Are you booting with grub (legacy/bios) or systemd-boot (uefi)?

In the bridge-vids option, you can replace 2-4094 with a space-separated list of vlans to be allowed tagged ingress/egress on the bridge interface, if you prefer to limit it. Nothing in the GUI for that, as far as I know.