Is it possible to do partial shader storage buffer rewrites?

[FeatheredOrbit]

Hi. I've used a material2d to instance entities into a single draw call, and I store the data I send over to the gpu in a Hashmap. I made my own frustum culling to avoid some issues with instancing and so that I only need to update some entries in the Hashmap. But the thing is that, for what I understand, when you try to update the shader storage buffer of the material, it seems to expose only set_data() which fully rewrites the buffer, this kinda defeats the point of everything I did since I still have to build a vector from the hashmap and give it that, while I could directly update the stale data. So I wanted to know if there's any other way to do it while still using materials?