Migrations - Create Content: Import JSON via contentful-cli script

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Task: I have created a content-type ParentElement which has a field category as a reference to another content-type defined. Now I want to import/create several content entries for the ParentElement where I want to create also new categories and then link the newly created category to the ParentElement (see code-example) and upload it via the contentful-cli (contentful space import [...]).

Question: Is there a way to create new entries of a referenced-content-type inside of the json which then should be imported via the contentful-cli?

Code-Example:

{
  "entries": [
    {
      "sys": {
        "contentType": {
          "sys": { "type": "Link", "linkType": "ContentType", "id": "expertItemNew" }
        }
      },
      "fields": {
        "title": {
          "de-DE": "Title1",
          "en": "Title1"
        },
        "category": {
          // referencing to a category which already exists
          "de-DE": { "sys": { "type": "Link", "linkType": "Entry", "id": "xTx8oAEnSr3MBr8wAIaik" } }
        },
        "street": { "de-DE": "Mainstreet 1" }
      }
    },
    {
      "sys": {
        "contentType": {
          "sys": { "type": "Link", "linkType": "ContentType", "id": "expertItemNew" }
        }
      },
      "fields": {
        "title": {
          "de-DE": "Title2",
          "en": "Title2"
        },
        "category": {
            //** How can I create a new reference and not just referencing one which already exists?**
            "de-DE": { /**???**/ } }
        },
        "street": { "de-DE": "Mainstreet 2" }
      }
    },
  ]
}