A new asset coming up. It's a simple uUGI particle image that does not require multiple cameras, shaders or custom layers. Simply do Right-Click - UI - Particle Image and you are done.
Manual: https://kamgam.com/unity/UGUIParticle...
Store: https://assetstore.unity.com/packages...
Store link is with affiliate id, if you prefer one without then here you go: https://u3d.as/3dqT
It's currently in review by Unity (should be available in a couple of weeks).