About three months ago, I submitted a proposed patch for changing how the ParticleInstance modifier works in Blender (https://developer.blender.org/D9100). Since then, there has been no feedback. I have no idea if this will be reviewed and acted on or if it will just be ignored. I feel this is a very useful feature and would like to see it incorporated into the Blender program so that I may be able to use it in the future.
Don't be afraid to nudge the developers if it's been a while. You could do that on https://blender.chat in the
#blender-coders channel, or by mentioning the assigned reviewer in the patch comments.