This component directly controls the particle.
Note
This component won't work for either manually-emitted particles, or entity-based particle emitters that aren't in local space.
"minecraft:particle_motion_parametric": {
// directly set the position relative to the emitter.
// E.g. a spiral might be:
// "relative_position": ["Math.cos(Params.LifeTime)", 1.0,
// "Math.sin(Params.Lifetime)"]
// defaults to [0, 0, 0]
// evaluated every frame
"relative_position": [<float/molang> <float/molang> <float/molang>]
// directly set the 3d direction of the particle
// doesn't affect direction if not specified
// evaluated every frame
"direction": [<float/molang> <float/molang> <float/molang]
// directly set the rotation of the particle
// evaluated every frame
"rotation": <float/molang> <default:0>
}}