Add custom html between two model fields in Django admin's change_form

[mf]

Let's say I've two models:

    class Book(models.Model):
        name = models.CharField(max_length=50)
        library = models.ForeignKeyField('Library')

    class Library(models.Model):
        name = models.CharField(max_length=50)
        address = models.CharField(max_length=50)
        tel = models.CharField(max_length=50)

Is there a nice way to add some html(a readonly input field) between
name and address in the Library change_form template?. I'm doing it
overriding [admin/includes/fieldset.html][1] but it's getting messy
and I can't find a way to display the html exactly where I want to.
For example, if I want to add html displaying the amount of books that
the library has below the name field I woul do this:

    {% for field in line %}
        ...
        {% if field.field.name == 'name' %}
            {{ field.field }}
            <div class="form-row total_books">
                <div>
                    <label for="total_books">Total books:</label>
                    <input type="text" maxlength="10" name="totbooks"
id="totbooks" readonly="readonly">
                </div>
           </div>
        {% else %}
            {{ field.field }}
        {% endif %}
        ...
    {% endfor %}


  [1]: 
https://code.djangoproject.com/browser/django/trunk/django/contrib/admin/templates/admin/includes/fieldset.html

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