foundryvtt-reve-de-dragon/templates/item-chant-sheet.html

<form class="{{cssClass}}" autocomplete="off">
  {{>"systems/foundryvtt-reve-de-dragon/templates/header-item.html"}}
  {{!-- Sheet Body --}}
  <section class="sheet-body">
    <div class="form-group">
      <label class="item-label" for="system.niveau">Niveau</label>
      <input class="attribute-value" type="text" name="system.niveau" value="{{system.niveau}}" data-dtype="Number"/>
    </div>
    <div class="form-group">
      <label for="system.reference">Référence / Auteur</label>
      <input class="attribute-value" type="text" name="system.reference" value="{{system.reference}}" data-dtype="String"/>
    </div>

    {{>"systems/foundryvtt-reve-de-dragon/templates/partial-item-description.html"}}
  </section>
</form>