TTML Captions Not Displaying

ANSWERED:
Self answering the question based off looking at other forum member's JSON (thank you all).   Captions are a list and each caption is an item, and as such I needed to wrap them in a square bracket.

Corrected:
"captions": [ { object }, { object } ]

Corrected JSON...

{
	"providerName": "kmov.com",
	"lastUpdated": "2017-09-12T21:09:37+00:00",
	"language": "en",
	"shortFormVideos": [{
		"id": "Clip13702236",
		"title": "C-17 jets take off from Scott Air Force Base to bring supplies to Hurricane Irma victims",
		"shortDescription": "U.S. Air Force pilots are delivering supplies to Hurricane Irma victims in Florida.",
		"genres": ["news"],
		"tags": ["news"],
		"releaseDate": "2017-09-12T17:22:14+00:00",
		"longDescription": "U.S. Air Force pilots are delivering supplies to Hurricane Irma victims in Florida.",
		"thumbnail": "http:\/\/cdn-images.meredithlmg.com\/KMOV\/800\/16:9\/13702236_vf.jpg",
		"content": {
			"dateAdded": "2017-09-12T17:22:14+00:00",
			"duration": 125,
			"videos": [{
				"url": "http:\/\/kmov.videodownload.worldnow.com\/KMOV_1209201712165100000AA.mp4",
				"videoType": "MP4",
				"bitrate": 3157813,
				"quality": "HD"
			}, {
				"url": "http:\/\/kmov.videodownload.worldnow.com\/KMOV_1209201712165100000AB.mp4",
				"videoType": "MP4",
				"bitrate": 961178,
				"quality": "HD"
			}],
			"captions": [{
				"url": "http:\/\/KMOV.images.worldnow.com\/metadata\/13702236.ttml",
				"language": "en",
				"captionType": "CLOSED_CAPTION"
			}]
		}
	}],
	"categories": [{
		"name": "Top Headlines",
		"playlistName": "News",
		"order": "most_recent"
	}]
}

Caption now operating beautifully.  Thanks again for sharing your JSON in the forums.