MSON Data structures are not working on v2.2.1

When I write mson data structures in my api.md like this:
```
## Data Structures

### serversNum (object)

- `ip`: `string` (string)
- `num`: `0` (number)

### onlineNum (object)

- `totalNum`: `0` (number)
- `serversNum` (array[serversNum])
```
the json scheam it parsed is
```
{
"$schema": "http://json-schema.org/draft-04/schema#",
"type": "object",
"properties": {
"totalNum": {
"type": "number"
},
"serversNum": {
"type": "array"
}
}
}
```
the schema of `serversNum` is missing!
So How can I solve this problem??