Scripting API

ScreenSpaceAmbientOcclusion

class in UnityEngine.Rendering.Universal · Unity.RenderPipelines.Universal.Runtime · inherits from ScriptableRendererFeature

Not in Unity's public API, or in an assembly the coverage doesn't count.
In Tassix

URP's screen space ambient occlusion feature: the renderer darkens each camera's opaque geometry by how enclosed it is, from the depth buffer, before the transparent (as with its After Opaque option).

Methods 2

void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
void Create()