How to configure DHCP on router to manually define the routing table distributed to users?

I have a router in my home, to which there are several devices coected to it (over Wi-Fi and Etheet) and get the network information through DHCP. I want to configure the protocol, so I can provide an entry in the routing table distributed to every coected device. I look for a general way, because I understand every router is different, but also my model is CBN CH6643E from Vodafone/ONO (Spain).

My question is: how do I do that? are these household routers intended/allowed to do this?. Note that I don't pretend to manually edit the routing table of the devices but alter the table they receive in their DHCP configuration.

Also: I have a Linux distribution and soon I will have a microcomputer (raspberry-like) capable of ruing Linux too, in case there's a solution that requires it.