Set the scale to apply during parsing, parse the file, and create a new skeleton.
          skeletonJson.scale = 0.4;
          let skeletonData = skeletonJson.readSkeletonData(
            assetManager.require(skeletonFile)
          );

            // Create a SkeletonMesh from the data and attach it to the scene
            skeletonMesh = new spine.SkeletonMesh({
              skeletonData,
              materialFactory: (parameters) => {
                return new THREE.MeshBasicMaterial({
             