for each player on client side

Im making a mod that uses particles.
The problem is, whenever I summon the particles, if its server side, I cannot specify velocity, so it needs to be client side, but if its client side, not all players can see it.
The 'for each player in current world' loop doesn't work for some reason, I think it might just be looping for the number of players, not running the code for each specific player.

i have looked online, and the only other way I can see, is to use a packet, and that is not supported my MCreator.

so, how would I make the code run specifically for each player?

if anyone could help, I would be thankful, as I've been trying to do this for days now.