[Feature Request] Particles on player join and announcement

[Luncaaa]

Is your feature request related to a problem? Please describe.
It's not related to a problem.

Describe the solution you'd like
I suggest that when a player joins or in an announcement, there are particles on players.

Describe alternatives you've considered
On each announcement (can be actionbar, bossbar...) an extra option that is particle= so when something is announced, there are particles on the player. Particles would last the same duration as the announcement. (Like for example, if the bossbar is there for 12 seconds, particles too)

And on join-section, adding particle= too but maybe particle-duration too?

If it isn't much, one being particle=CUSTOM and you can set RGB color.