Combine two gateways

[matinkg]

On my network, I have two routers and each router is connected to the internet individually. Router 1 IP is 192.168.1.1 and router 2 IP is 192.168.1.2. So I can specify which internet to use by setting the default gateway. If I want to use first router's internet, I set default gateway to 192.168.1.1 and if I want to use the second router's internet, I set it to 192.168.1.2.
I just wonder is it possible to combine them together and use them simultaneously?

Btw, If I have two devices (1 ethernet, 1 wifi), I can combine them using dispatch. But I'm looking for a way to just use one interface like ethernet or wifi only.

[gitUP779]

https://sourceforge.net/projects/forcebindip-gui/