How to access stdlib.hlsl?,How to access StdLib.hlsl

I wanna to use TEXTURE2D_SAMPLER2D macro but it was required stdlib.hlsl that locate in C:\Users\achonor\AppData\Local\Unity\cache\packages\packages.unity.com\com.unity.postprocessing@2.0.11-preview\PostProcessing\Shaders\StdLib.hlsl. I sholud know how to access it, I use absolute path but unity shader compiler can’t open it. Help me, please! Thanks!,

Going out on a limb here but have you tried #include "HLSLSupport.cginc" ?

Sorry,I try it before but it does not work.