Is it possible to make me stay as an Object? something like that:

{
  name: "Name custom",
  item: [{ key: "key-custom", value: "value-custom" }],
}

You are stringify’ing it so… try not doing that.

when i try this:

const notificationTableItem = new aws.dynamodb.TableItem(
  "notificationTableItem",
  {
    tableName: notificationTable.name,
    hashKey: notificationTable.hashKey,
    item: obj as unknown as Input<string>,
  }
);

it gives me this error:

error: aws:dynamodb/tableItem:TableItem resource 'notificationTableItem' has a problem: Attribute must be a single value, not a map. Examine values at 'TableItem.Item'.