bedrock-samples/resource_pack/animations/bow.animation.json

{
  "format_version": "1.10.0",
  "animations": {
    "animation.bow.wield": {
      "loop": true,
      "bones": {
        "rightitem": {
          "position": [ "c.is_first_person ? -5.5 : 0.5", "c.is_first_person ? -3.0 : -2.5", "c.is_first_person ? -3.0 : 1.0" ],
          "rotation": [ "c.is_first_person ? 38.0 : 0.0", "c.is_first_person ? -120.0 : 0.0", "c.is_first_person ? -63.0 : 0.0" ]
        }
      }
    },
    "animation.bow.wield_first_person_pull": {
      "loop": true,
      "bones": {
        "rightitem": {
          "position": [ -1.5, " 2.5 + ( variable.charge_amount  >= 1.0 ? math.sin( (q.life_time) * 1000.0 * 1.3) * 0.1 - math.sin(q.life_time * 45.0) * 0.5 : 0.0)", -4.8 ],
          "rotation": [ -53.0, 8.0, 35.0 ]
        }
      }
    }
  }
}