UnityCACAO-HDRP17/com.unity.render-pipelines.high-definition/Documentation~/snippets/shader-graph-blocks/baked-back-gi.md

Baked Back GI The global illumination (GI) value to apply to the back face of the Mesh only. This replaces the built-in diffuse GI solution.
This port only appears when you enable the Override Baked GI setting. Override Baked GI enabled 0.0