How to set the desired default gateway in virtualbox?

Question

virtual box

I am running an emulator of one secret system on Virtual Box.
Ip are assigned only automatically, manually in any way.
This system picks up the gateway of the root system - 192.168.0.1 It is
necessary that something would pick up the gateway 192.168.0.55.
How to make it pick up the gateway 192.168.0.55?
That is, it is necessary to use virtualbox to let all the traffic of the emulator through 192.168.0.55
Mac os root system