Question Bounds of particles

Hi, everyone! I couldnt find any information how to change shape of bounds of particles. For example, I want to change this circle shape of bound to shape of this particle texture. Please, help me.

 

Not sure what that gizmo is but I don't think it is the bounds.

I don't think there's any facility to show bounds of particles.

When you select the shape module of the particle system there is a light blue outline visible depending on the emission shape only.

 

Yeah, I know what this gizmo is. I turned it on to show real physical shape of this particle. But I want to change it's SHAPE. I want to make it not circle but something like that (red lines I drew)

 

Pretty sure it only supports circular / spherical. I base this assumption on:

When collisions are enabled, the size of a particle is sometimes a problem because its graphic can be clipped as it makes contact with a surface. This can result in a particle appearing to “sink” partway into a surface before stopping or bouncing. The Radius Scale property addresses this issue by defining an approximate circular radius for the particles, as a percentage of its actual size. This size information is used to prevent clipping and avoid the sinking-in effect.

which I got from:

https://docs.unity3d.com/Manual/PartSysCollisionModule.html

I think to get tumbly odd-shaped stuff you would need to use Rigidbody / Rigidbody2D physics.