Feature Request GPU Instancing in Shader

I'm new to shader development. Picked this shader from LeanTouch (https://assetstore.unity.com/packages/tools/input-management/lean-touch-30111).
Want to Add GPU Instancing in this anybody can help i would be thankful to him/her.

Shader "Lean/Common/Object"

{

    Properties

    {

        _MainTex("Main Tex", 2D) = "white" {}

        _Color("Color", Color) = (1.0, 1.0, 1.0, 1.0)

        _Color1("Color 1", Color) = (1.0, 0.5, 0.5, 1.0)

        _Color2("Color 2", Color) = (0.5, 0.5, 1.0, 1.0)

        _Rim("Rim", Float) = 1.0

        _Shift("Shift", Float) = 1.0

    }



    SubShader

    {

        Tags

        {

            "Queue" = "Geometry"

            "PreviewType" = "Sphere"

            "DisableBatching" = "True"

        }



        Pass

        {

            CGPROGRAM

            #pragma vertex Vert

            #pragma fragment Frag



            sampler2D _MainTex;

            float4    _Color;

            float4    _Color1;

            float4    _Color2;

            float     _Rim;

            float     _Shift;



            struct a2v

            {

                float4 vertex    : POSITION;

                float2 texcoord0 : TEXCOORD0;

                float3 normal    : NORMAL;

                float4 color     : COLOR;

            };



            struct v2f

            {

                float4 vertex : SV_POSITION;

                float2 uv     : TEXCOORD0;

                float3 normal : TEXCOORD1;

                float4 color  : COLOR;

            };



            struct f2g

            {

                float4 color : SV_TARGET;

            };



            void Vert(a2v i, out v2f o)

            {

                o.vertex = UnityObjectToClipPos(i.vertex);

                o.uv     = i.texcoord0;

                o.normal = mul((float3x3)UNITY_MATRIX_IT_MV, i.normal);

                o.color  = i.color * _Color;

            }



            void Frag(v2f i, out f2g o)

            {

                float rim = _Shift - pow(saturate(1.0f - normalize(i.normal).z), _Rim);



                o.color = tex2D(_MainTex, i.uv) * lerp(_Color1, _Color2, rim) * i.color;

            }

            ENDCG

        } // Pass

    } // SubShader

} // Shader

 

https://docs.unity3d.com/Manual/GPUInstancing.html

 

Thank You For Your Help