Ensure inclusion of details of dcat:theme values from extra-metadata.json into @graph of ro-crate-metadata.json

[laurianvm]

context

The extra-metadadata.json:

• represents additional information
• is manually created
• in json format
• example: extra-metadata.json of arms-mbon/data_release_001

The ro-crate-metadata.json

• represents the description of an ro-crate (~ detailed description of content & structure of an ro-crate)
• is automatically generated
• in json-ld format
• information from extra-metadata.json gets included in this file
• example: ro-crate-metadata.json of arms-mbon/data_release_001

Description of issue

New agreement:
dcat:theme values in extra-metadadata.json:

{
    "./": { 
             "dcat:theme": [
                { "@id": "https://vocabularyserver.com/asfa/?tema=2365" },
                ...
             ] ,
     } ,
}

should be included in ro-crate-metadata.json like:

{
    "@context": "https://w3id.org/ro/crate/1.1/context",
    "@graph": [
            {
                        "@id": "./",
                        "@type": "Dataset",
                        "label": "./",
                        "dcat:theme": [
                                { "@id": "https://vocabularyserver.com/asfa/?tema=2365" },
                                ...
                         ],
            }
            …
            {
                 "@id": "https://vocabularyserver.com/asfa/?tema=2365",
                  "@type": "skos:Concept",
                  "skos:prefLabel" : “genetics”
            }
    ]
}

Concretely:
following the inclusion of info from extra-metadata.json into ro-crate-metadata.json,
an extra step is needed to also include the details further in the graph