What parts to make direct control override with rasberri pi/jetson nano (relays)

[AwokeKnowing]

I've ordered a vehicle which has forward/backward and 'spin left/spin right'

I plan to control it with a Jetson Nano which is like rasberri pi but more powerful. Point is I'll use 3.3v GPIO for signal control.

currently, my plan is to get two 'solid state relays' that I can switch with gpio signal. then I will just pull the wires out the the foward/back spinleft/spinright controls. and connect them to the relay.

With this, I should be able to do rudimentary control.

Question 1: Do I need high amp relays to control these 'switches' or are they already using some kind of relay so it will be low current? (ie, what relays do I need)

Question 2: How could I pull power (up to 20 watts 5V) from battery into Jetson (or is it not worth it?)

Question 3: Am I missing something? I grabbing 2 relays controlled by gpio, and connecting them to the wires that go into the controls not going to give me control of the vehicle?

Here is the vehicle
https://www.wayfair.com/outdoor/pdp/kon ... d=59995891

here is example relay:
https://www.waveshare.com/3-ch-relay-fo ... n-nano.htm

but the relay above says max load: ≤5A 250V AC or ≤5A 30V DC