The answer is going to depend on the model of SolArk since there are several different passthrough capacities. You really need to post your model number for a meaningful answer.
I don’t have a SolArk but you can set the charge current on many L2 chargers to stay within the capacity of your inverter/battery.
I don’t know if there are good purely off grid automatic L2 throttling solutions. Most of the residential off the shelf options assume you are on grid and use zero export/self consumption kind of tactic to absorb excess solar. Going down the rabbit hole yet more, those solutions also seem biased towards installations without batteries, you would probably need a solution from SolArk to get the capability to prioritize EV charging vs battery charging. Or get good with programming your own.
