Q: How to serialize/unserialize FullFaceDescriptions?

Detecting faces is great, but can be slow. I'd like to save the detections to an IndexDB and do some math on them when all are completed.

Is there a standard/easy way to do this? I've got a Dexie hacky way with

db.addFace = async function(imageName, tileLocation, ffd) {
  return await db.faces.add({
    'image_name':imageName,
    'tile_x':tileLocation.x,
    'tile_y':tileLocation.y,
    'x':ffd.detection.box.x,
    'y':ffd.detection.box.y,
    'w':ffd.detection.box.width,
    'h':ffd.detection.box.height,
    'score':ffd.detection.score,
    'descriptor':ffd.descriptor,
    'landmarks': ffd.landmarks,
    'expressions': ffd.expressions
  });
};

that I'm sure is a bad idea.