Need support Json multiple line array

The json array grammar need to be able to expand as multiline in the same way of json obeject:
Insert a enter then format, then the multiline will be triggered, but not only depends on line length compress. Like below:
```json
"members": [{ "mode": "init" }, { "options": "extra1,extra2" }]
```
to
```json
"members": [
	{ "mode": "init" }, 
	{ "options": "extra1,extra2" }
]
```
