Severity schema should it be a map rather than an array?

I noted in latest version of schema the addition of severity but seems to allow for multiple score of the same type without a means to distinguish so if you wanted to favour a severity say from a source it is challenging to work out. Currently there are only in database CVSS_V3 because of this lack of being able to distinguish identical score types should the data struct instead of being

"severity" : [
    {
         "type":"string",
         "score":"string"
    }
]

as types really should be unique base don this

"severity" : {
     "type_key" : "score"
     ....
}

You could even enumerate the types supported but this allows same flexibility bit avoids the doubt around duplicate values as that is simply not valid.

So what is done today in the database would be;

"severity" : {
    "CVSS_V3": "CVSS v3 score uri"
    "CVSS_V2":"CVSS v3 score uri"
    "ANotherseverityscore": "An other score"
}