Hey, you might want to check Unity’s Custom Vertex Stream, there’s some knowledge about it on the forum.
https://realtimevfx.com/t/unity-custom-vertex-stream-and-shadergraph-amplify-shader/9524
https://realtimevfx.com/t/unity-custom-stream-and-shaderforge/2300/3
Hope it helps and have a great day 
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