unity intersection shader that blocks the area behind it

Question

similar to this question Unity Intersections Mask, but I also want some objects to be able to block the areas behind them,

so the circle would ideally block the rendering of objects behind it in the plane.

I am thinking I can assign a slightly different shader to those objects, but I am new to unity shaders, so I don't know where to start. I am currently using this shader, how can I modifiy it to achieve this effect?

Shader "Unlit/CrossSection"

{ Properties { _Color ("Color", Color) = (0, 0, 0, 0) _Section("Section Plane", Vector) = (0, 1, 0, 0) } SubShader { Tags { "RenderType"="Opaque" "Queue"="Transparent"} LOD 100

    Pass
    {
        CULL Back
        Blend Zero One

        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
        #include "UnityCG.cginc"

        struct v2f
        {
            float4 vertex : SV_POSITION;
            float sectionDepth : TEXCOORD0;
        };

        float4 _Section;

        v2f vert (float4 vertex : POSITION)
        {
            v2f o;
            o.vertex = UnityObjectToClipPos(vertex);

            float3 worldPosition = mul(unity_ObjectToWorld, vertex).xyz;
            float cameraSide = sign(_Section.w - dot(_WorldSpaceCameraPos, _Section.xyz));
            o.sectionDepth = cameraSide * (dot(worldPosition, _Section.xyz) - _Section.w);

            return o;
        }

        fixed4 frag (v2f i) : SV_Target
        {
            clip(i.sectionDepth);
            return 0;
        }
        ENDCG
    }

    Pass
    {
        CULL Front

        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
        #include "UnityCG.cginc"

        struct v2f
        {
            float4 vertex : SV_POSITION;
            float sectionDepth : TEXCOORD0;
        };

        fixed4 _Color;
        float4 _Section;

        v2f vert(float4 vertex : POSITION)
        {
            v2f o;
            o.vertex = UnityObjectToClipPos(vertex);

            float3 worldPosition = mul(unity_ObjectToWorld, vertex).xyz;
            float cameraSide = sign(_Section.w - dot(_WorldSpaceCameraPos, _Section.xyz));
            o.sectionDepth = cameraSide * (dot(worldPosition, _Section.xyz) - _Section.w);

            return o;
        }

        fixed4 frag(v2f i) : SV_Target
        {
            clip(i.sectionDepth);
            return _Color;
        }
        ENDCG
    }
}

}