Note that JsonElement is nullable (for a reason elsewhere in my project):
JsonElement? json = JsonSerializer.Deserialize<JsonElement?>(jsonData);
List<JsonElement?> itemsArray = json?.EnumerateArray().ToList();
The error in this code says: Cannot convert from List<JsonElement> to List<JsonElement?>
>Solution :
Working with .Select() from System.Linq to casting each element to Nullable<JsonElement> type.
using System.Linq;
List<JsonElement?> itemsArray = json?.EnumerateArray()
.Select(x => x as Nullable<JsonElement>)
.ToList();
Or with .Cast<T>().
List<JsonElement?> itemsArray = json?.EnumerateArray()
.Cast<JsonElement?>()
.ToList();