How to pick specific elements from a jsondecode in flutter - json

Question

I am planning to take distance and time from a JSON list provided by google distance API however I have no idea how to specifically take the elements, here's the code I use to get the json
Future<Map<String, dynamic>> getDistance(
String Origin, String Destination) async {
final String url =
'https://maps.googleapis.com/maps/api/distancematrix/json?origins=$Origin&destinations=$Destination&key=$key';
var response = await http.get(Uri.parse(url));
var json = convert.jsonDecode(response.body);
//print("JSON:"+json['rows'].toString());
var results = {
'info':json['rows'],
};
return results;}
printing results will give,
"rows": [
{
"elements": [
{
"distance": {
"text": "17.6 km",
"value": 17574
},
"duration": {
"text": "27 mins",
"value": 1642
},
"status": "OK"
},
{
"distance": {
"text": "12.8 km",
"value": 12840
},
"duration": {
"text": "22 mins",
"value": 1323
},
"status": "OK"
},
{
"distance": {
"text": "12.7 km",
"value": 12693
},
"duration": {
"text": "29 mins",
"value": 1753
},
"status": "OK"
}
]
},
{
"elements": [
{
"distance": {
"text": "1 m",
"value": 0
},
"duration": {
"text": "1 min",
"value": 0
},
"status": "OK"
},
{
"distance": {
"text": "25.1 km",
"value": 25135
},
"duration": {
"text": "36 mins",
"value": 2160
},
"status": "OK"
},
{
"distance": {
"text": "40.1 km",
"value": 40107
},
"duration": {
"text": "48 mins",
"value": 2858
},
"status": "OK"
}
]
},
{
"elements": [
{
"distance": {
"text": "26.2 km",
"value": 26187
},
"duration": {
"text": "34 mins",
"value": 2048
},
"status": "OK"
},
{
"distance": {
"text": "1 m",
"value": 0
},
"duration": {
"text": "1 min",
"value": 0
},
"status": "OK"
},
{
"distance": {
"text": "7.7 km",
"value": 7690
},
"duration": {
"text": "17 mins",
"value": 1046
},
"status": "OK"
}
]
},
{
"elements": [
{
"distance": {
"text": "31.5 km",
"value": 31482
},
"duration": {
"text": "42 mins",
"value": 2548
},
"status": "OK"
},
{
"distance": {
"text": "9.7 km",
"value": 9726
},
"duration": {
"text": "22 mins",
"value": 1298
},
"status": "OK"
},
{
"distance": {
"text": "1 m",
"value": 0
},
"duration": {
"text": "1 min",
"value": 0
},
"status": "OK"
}
]
}
],
"status": "OK"
I only need the distance and duration however I have no idea how to take it, since I tried using,
var results = {
'info':json['rows'][0][elements],
};
and it only take the 1st elements. I am planning to make a distance between multiple points, I have rearrange the points so I can take certain results from the matrix,
I am still new in json decoding and have no idea what to do