Fade in a stencil mask Shader

Unity Engine
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1

Im working with a custom stencil mask shader in my scene that I’ve applied to a plane so that objects of a specific tag are only visible when viewed through this plane. Below is the code for my shader along with an image of it working.

Shader "Custom/StencilGeom"
{
    Properties
    {
        [IntRange]_Stenci1ID ("Stenci1 ID", Range(0, 255)) = 0
    }
    SubShader
    {
        Tags
        {
                "RenderType"="Opaque"
                "Queue" = "Geometry"
                "RenderPipeline" = "UniversalPipeline"
        }
        Pass
        {
            Blend Zero One
            ZWrite Off
            Stencil
            {
                Ref[_Stenci1ID]
                Comp Always
                Pass Replace
                Fail Keep
            }
        }
    }   
}

image
image876×378 66.9 KB

From here Im want to fade the shader across the plane so that one half of the plane is transparent and gradually fades into the stencil mask on the other half. I was thinking of applying an alpha channel with a gradient map like the one below. However Im very new to creating custom shaders so Im unsure of how to apply this map properly to the current shader. Any help or advice would be greatly appreciated! Thanks in advance!
image