Shadows in AR

I’m using Ground Plane and want my assets to cast shadows onto the ground. I’ve managed to do this so far by using a specific transparent shader - I’ve seen a couple of these out there. However, I can only use directional lights for this.

Anyone had any experience using point lights or a different lighting setup? So far my shadows are very crisp and I’d like to soften them somehow - so I’m hoping point lights or spot lights would work better.

 

Can you please share the shader that have been working for you to cast shadows with Ground Plane and directional lights?