How to create { " key1" : {"keyChild": "value" } } output

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How to create { " key1" : {“keyChild”: “value” } } output

How can I create
{ " key1" : {“keyChild”: “value” } } output

where key1 is dynamic

example:
the goal, dictionary object
{
“DER”: {
“shorts”: “DER”,
“longs”: “Distributed Energy Resources”,
“details”: “”
},

"ABC": {
    "shorts": "ABC",
    "longs": "Albania Broadcasting Company",
    "details": ""
}

}

what I could do now, just array of objects
[{
“shorts”: “DER”,
“longs”: “Distributed Energy Resources”,
“details”: “”
},
{
“shorts”: “ABC”,
“longs”: “Albania Broadcasting Company”,
“details”: “”
}
]