I am working with several Ubuntu Virtual Machines with VBox (Version 7.0.18 r162988 (Qt5.15.3)) on a Ubuntu host. My goal is to be able to open a terminal on the VM from a terminal of the host, and eventually run commands/scripts on it.
The network settings of the VM are based on a NAT connection with host port number 2200 and guest port 22. I am able to connect to the VM via ssh using
ssh -X -p 2200 name@localhost.
Once I log in I can run commands as normal, however I want to run a simulator on the VM with multiple graphic windows, and while the code is correctly compiled and the application is launched, I cannot display it anywhere.

What I am basically trying to do is to find a way to open a terminal on the guest VM via a terminal on the host, instead of connecting via ssh and making the terminal of the host as if it is a terminal of the guest.

The idea is to establish a sort of remote desktop connection to the VM, however I have no idea on how to set it up without installing too much software (the host is a shared server).