[1.19.3] How to animate player-like swinging arms on mobs

[SoLegendary]

I have a custom humanoid mob with arms that I can directly control the XYZ rotation values of. I want to be able to trigger a swinging animation just like the one that the player has when left clicking.

I've tried using the LivingEntity.swing() method from clientside but it doesn't seem to do anything. I understand it probably needs to be triggered from serverside so that all clients can see the animation, but I'm just testing it for the time being.

Is there a way I can use a swing() method here or something similar or do I need to actually meticulously set the rotation values of my mob's arm myself? If the latter, where are those calculations done so I can copy the numbers?

[ChampionAsh5357]

See LivingEntity#getAttackAnim and follow the fields in there to see how they are modified by default.