All used data is available on Correios, Google Maps and Open Street Maps.
No. It is pure JSON and I have no intention to develop methods to manipulate this data.
Following the KISS statements, it it simple as possible, the basic schema is below.
[
{
"name": "Acre",
"cities": [
{"name": "Rio Branco"}
]
}
]
Just open an issue and I'll fix.