This is a paid asset, but now you can download MicroSplat – HDRP 2021 Support for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
MicroSplat – HDRP 2021 Support v3.9.9 (Latest version)
MicroSplat HDRP 2021 v3.9
(Tested with Unity version 2020.3.23f1)
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Adds support for Unity’s High Definition Render Pipeline (HDRP) in Unity 2021.2 and Unity 2021.3LTS (when released) to MicroSplat
Unity’s new Scriptable Render Pipeline (SRP) requires a full rewrite of all shaders for each version of each SRP. This module adds support for targeting the High Definition Render Pipeline shipping with Unity 2021.2 and Unity 2021.3LTS shortly after release.
HDRP12.x in Unity 2021.2
Will add support for HDRP13.x in Unity 2020.3LTS shortly after release