Question Any way to set Render Pass to "After Post-process" on HLSL/Cg shaders?

I'm trying to edit a TextMeshPro shader so that it renders after in the "After Post-process" render pass. According to some shaders I've looked at, that seems to have a numeric value of 2501. However, I've tried assigning this to the render queue of this shader, and empirically it doesn't cause the text to render after post-processing:



Is there something I can set in the shader's Queue tag to get a shaderlab shader to render after post-processing? Or is that a special feature that only works with new shaders?