How to properly using a FxaaShader.usf in my PP material?

Development Rendering
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Since my post-process material works with Translucency Pass = After Motion Blur, it draws after the built-in anti-aliasing pass. And after the work of this material, I need to implement FXAA in it to solve the problem with aliasing

Is there any way to use FXAAShader.usf in the custom node of this post process material?

I’m trying to do it like this, but there is an error:

UnrealEditor_x1JUwdicWG
UnrealEditor_x1JUwdicWG1688×754 188 KB

Maybe someone knows how to make AA using standard nodes?

Thanks