This is a paid asset, but now you can download Subsurface Scattering Shader Free.
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Subsurface Scattering Shader v2021.2 (Latest version)
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Integrated into Lambert and Blinn-Phong shading models this shader package offers simple and fastest subsurface scattering effect even on mobile devices.
Shaders are Curved World 2020 compatible.
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Supported Unity versions: 2018.4, 2019.4, 2020.2.1 or higher.
• Shaders support only Built-in render pipeline.
• Shaders are not dedicated primarily for human skin rendering.