Hello Omar, Welcome to the Forums.
There is a ‘Vehicle Health’ variable on the Tank Spawner that you can set. But as far as dynamically changing HP I think we’d need to see something like a ‘SetCurrentHealth’ function in the API first
Edit: after seeing Mineblo’s post: It looks like a vehicle is 'Healtful" and can have it’s HP set.
Beyond that there is not much you can change. - For Damage, you might be able to use the ‘Damage Amplifier’ powerup?
“Changing the tank” would currently involve attaching a mesh particle (driven by Niagara) - But that would be janky and doubly janky in the context of a rotating turret.
There’s also no control over the in-tank UI. (Unless you’re adding your own UI overtop of things)
Even for other vehicles there is not much direct control (Top Speed, Acceleration) so I think the best we can hope for is some sort of future ‘Custom Vehicle’ support.