Can I render a Niagara particle system to custom depth?

I’m trying to render a particle system to a custom depth post process. It seems to work absolutely fine for static and skeletal meshes but not with a Niagara particle material.

The settings for custom depth pass do exist within both the particle sprite material and the Niagara emitter itself; I’ve checked that these are both enabled but neither seem to be doing anything.

This is resolved in UE 4.26

New: Niagara particles will now properly support custom depth writes, lighting channels, disabling rendering in the main pass, and volumetric translucent shadows.