@moraesg To be able to see this field in a query, you have two options:

Create a field in the Pipe to store the due date (don't forget to select the option to synchronize this field with the original due date of the card. With the field, the due_date information will appear within your fields query.

If you don't have a due_date field, this information will be in the query header, as shown below:

query {
  card(id: 986108986) {
    id
    title
    due_date
    fields{
      name
      value

    }
  }
}