VocBench export JSON-LD file contains an array instead of an object

[lecoqlibre]

VocBench JSON-LD file export contains:

[
  {
    "@graph": []
  }
]

But should ideally be:

{
  "@graph": []
}

Some libraries don't support parsing arrays of graph(s) like seen in this issue: datafoodconsortium/connector-php#1.

As this is a valid JSON-LD file, I assume it's up to the library to support that.