How do I describe the a type in typescript that has dynamic name?

I want to describe a type that has the following behavior

export class myData {
    key          : string;
    display_name : string;  
}

However I want to have dynamic name for key and display_name

eg. the following would be valid myData type

mySample1:myData =
{ 
    myKey    : 'myKeyValue'
    myName   : 'myNameValue'
}

mySample1:myData =
{ 
    myKey2    : 'myKeyValue2'
    myName2   : 'myNameValue2'
}

Is this possible in typescript? If it is possible, is this a good idea in typescript?