Question Low Resolution Rendering Pass on Shader

Is there a way to lower the resolution of the rendering pass on a shader even lower than the "Low resolution" option given on a lot of shaders?

I'm asking because I have an HDRP game in which I have a lot of particle overdraw on screen (lots of particles). Using the shader's "Low resolution" option (in the Surface options on the shader) helps with performance tremendously. So I was just wondering if I can lower the resolution even further on a shader somehow? Is there a way to program that?