I have this dictionary "properties " with a key livenessTests and in turn the livenessTests is a list of dictionaries. How do I add/append livenessTests to another dictionary json?

Code:
properties = {

'livenessTests': [

{

'name':'http' + '_' + 'livenesstest',

'testObject':'/default.html'

},

{

'name':'https' + '_' + 'livenesstest',
...