Important to understand that Israel is not a signatory to the Rome Statute and rejects the ICC’s jurisdiction (neither is the USA). On the other hand, the Geneva Convention is about as “universal” a treaty as you can find, Israel itself ratified the GV without any reservations, all UN members (US and Israel included) are subject to the authority of the ICJ/World Court, and there’s even a fsir consensus that the GC applies to everyone, even if a state weren’t a UN member and signatory.
(While the USA and Israel have shown immense disdain for the ICC and the USA has levied sanctions against it, its chief prosecutor, and The Hague in the past, the US officially sponsored Khan’s nomination for the post of chief prosecutor this past round and Israel has been extremely chummy with him and the ICC compared to under Bensouda. The ICC under Khan hasn’t done anything about Gaza.)