Quick python script to combine several JSON files into one. File names are dict keys in the JSON output.

import os
import json

entries = os.listdir(os.getcwd())

animationFiles = [
  'aaa',
  'bbb',
  'ccc'
]

output = {}

for name in animationFiles:
  with open(name + '.json') as f:
    output[name] = json.loads(f.read())

outputFile = open('output.json', 'w')
outputFile.write( json.dumps(output) )

print('Done')