Question Render additional object into shadow map

Hi,

Im rendering an object using a custom pass in HDRP (I render a quad in front of camera and use depth offset)
It looks good, but it doesn't cast shadows.

How can I hook into the directional light shadow maps to add my object into it?
Seems we have access to events like LightEvent.AfterShadowMap, so it seems possible I can hook in and render my custom object into the shadowmap.

Its not clear if I can get the shadow map camera. Given its a screenspace effect I need to do the same effect in the shadowmap camera.


Alternatively is there a way for this to just work? It seems calling the shadowcaster pass manually doesnt work