There is a very useful application that, when given a JSON string, generates a Go type automatically trying to infer field types. You can find one deployed at this address: https://mholt.github.io/json-to-go/.

It saves some time and most of the time the data structure is already correct after a simple conversion. Sometimes, it needs some changes such as number types, for instance, if you want a field to be float, but your sample JSON has an integer.