Getting propery data of tiled objects

How do i get the chest_id from a tiled object? I am creating a group of chests from a tiled map layer.

let chests = scene.physics.add.group();
chests.addMultiple(map.createFromObjects(
    'Chests', {
        name: "chestSprite",
        classType: Chest
      }
  ));
  chests.playAnimation('chestclosed');

Here is my console log of a chest.

I thought i could use chest.chest_id but it returns undefined.
Thank you.

chest.getData('chest_id') or chest.data.values.chest_id.

Thank you sir!