The first administrative level in the address. This is typically the province in which the address is located. In the United States, this would be the state. In Switzerland, the canton. In the United Kingdom, the post town.
This hint will be translated to the below values on different platforms:
- web: "address-level1".
- Otherwise, the hint string will be used as-is.
static const String streetAddressLevel1 = 'streetAddressLevel1';