We can't add an extra shader keyword. For now if we have shadows enabled we compute occlusion on both directional and local lights.

ScriptableRenderPipeline/LightweightPipeline/LWRP/ShaderLibrary/Shadows.hlsl

 
 half LocalLightRealtimeShadowAttenuation(int lightIndex, float3 positionWS)
 {
-#if defined(NO_SHADOWS) || !defined(_LOCAL_SHADOWS_ENABLED)
+// TODO: We can't add more keywords to standard shaders. For now we use
+// same _SHADOWS_ENABLED keywords for local lights. In the future we can use
+// _LOCAL_SHADOWS_ENABLED keyword
+//#if defined(NO_SHADOWS) || !defined(_LOCAL_SHADOWS_ENABLED)
+#if defined(NO_SHADOWS) || !defined(_SHADOWS_ENABLED)
     return 1.0h;
 #else
     float4 shadowCoord = mul(_LocalWorldToShadowAtlas[lightIndex], float4(positionWS, 1.0));

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightStandard.shader

             #pragma multi_compile _ _VERTEX_LIGHTS
             #pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
             #pragma multi_compile _ _SHADOWS_ENABLED
-            #pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
+
+            // TODO: Enabled this when we have C# keyword stripping
+            //#pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
 
             // -------------------------------------
             // Unity defined keywords

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightStandardSimpleLighting.shader

             #pragma multi_compile _ _VERTEX_LIGHTS
             #pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
             #pragma multi_compile _ _SHADOWS_ENABLED
-            #pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
+
+            // TODO: Enabled this when we have C# keyword stripping
+            //#pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
 
             // -------------------------------------
             // Unity defined keywords