This is just a formality. I believe with recent updates to Reshade, PCSX2 recognizes Reshade by default. On the off chance there are complications, here are 2 links with external files to get Reshade working with either the DirectX PCSX2 plugin or the Open GL PCSX2 plugin.
directx
https://github.com/PCSX2/pcsx2/issues/2106
opengl
https://github.com/PCSX2/pcsx2/issues/2356