Flutter l10n - Dynamic key - json

Question

I am actually coding a multi-language app and I have a problem to get my resources on different languages. My app is currently working on one language with a json file.
For example I got :
{
"Resorts" : [
{
"name": "Walt Disney World Resort",
"slug": "waltdisneyworldresort",
"description": "Explorez des terres d'enchantement infini, où vos fantasmes deviennent réalité !"
},
{
"name": "Disneyland Resort",
"slug": "disneylandresort",
"description": "Regardez les rêves devenir réalité dans l'endroit le plus heureux de la planète !"
},
]
}
I started using l10n and I have my files app_en.arb:
{
"##locale": "en",
"resortDesc": "English description",
"#resortDesc": {
"description": "Description of the resort that will be displayed on the cards in the Resort Selection screen",
}
}
and app_fr.arb:
{
"##locale": "fr",
"resortDesc": "Description en Français",
"#resortName": {
"description": "Description du resort qui sera affiché sur la page 'Resort Selection'",
}
}
But this means that I need to call my texts with something like:
AppLocalizations.of(context)!.resortDesc
While I was calling my texts from my json as:
Future<void> readJsonDatas() async {
final String res = await rootBundle.loadString("assets/datas.json");
final data = await jsonDecode(res);
setState(() {
datas = data;
});
await datas;
for(var data in datas['Resorts']) {
parks.add(
Resort(name: data['name'], imagePath: data['image'], slug: data['slug'], bgImagePath: data['bg_image'], description: data['description'], parks: data['parks'] ?? [], lat: data['latitude'], long: data['longitude'])
);
}
currentResort = parks[0]; // Default park
}
Do you have any idea what I could do in app_en.arb and app_fr.arb to get my datas as:
AppLocalizations.of(context)!.datas['slug'].description
Or how I should do it ?
Many thanks for your tips,
Have a great day !