Transform component error

When I want to get the length of an array in the Transform Component :
```js
http-datasource {
body-length : ={$.http-datasource.body}.length
}
http-api {
body-length : ={$.http-api.body}.length
}
```
It works with the Transformer version 1 (V1), we can get the 2 lengths. (Even when typing ```$.http-datasource.body.length```)
But with the second version of the Transformer (V2), we can only get the second length in the http-api object.
No typo error has been made.

[Link](https://grappe.io/ihm/application.html#workspace/6329c7a31a1bfc0011bfe3b3/component)