sendNFT method
Implementation
Future<dynamic> sendNFT(String unresolvedFrom, String nftContractAddress,
String from, String to, int nftAmount, int nftId) async {
return _jsApi.jsObservable(
'window.transfer.sendNft("${unresolvedFrom}","${from}","${to}",${nftAmount},${nftId},"${nftContractAddress}")');
}