dbContextOptionsBuilder.UseNpdsql(connectionString, o => o.UseJsonb())context.MyEntityWithJsonbField
.Where(x => JsonbMethods.Value<string>(x.JsonbField, "jsonPropertyName") == "someValue")
.OrderBy(x => JsonbMethods.Value<int>(x.JsonbField, "otherJsonPropertyName"))
.Select(x => JsonbMethods.Value<int>(x.JsonbField, "thirdJsonPropertyName")).ToList();