about the use of setAttributes

so, in the second case do you want to update the same data-info attribute with a new key, right?

since data-info has a string as a type value, first you need to get it and parse to an object.

const dataInfoObject = JSON.parse(this.model.get('data-info'))

after that, you can update the object with the new key

dataInfoObject[newKey] = newValue

and then you change it back to string and replace the attribute value for your model

this.model.set('data-info', JSON.stringfy(dataInfoObject))

let me know if it works

I thinks he's just looking for addAttributes

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