foundry/Data/systems/dnd5e/templates/items/parts/item-spellcasting.hbs

<div class="form-group">
  <label>{{localize "DND5E.SpellProgression"}}</label>
  <div class="form-fields">
    <select name="system.spellcasting.progression">
      {{selectOptions config.spellProgression selected=system.spellcasting.progression}}
    </select>
  </div>
</div>

<div class="form-group">
  <label>{{localize "DND5E.SpellAbility"}}</label>
  <div class="form-fields">
    <select name="system.spellcasting.ability">
      {{selectOptions config.abilities selected=system.spellcasting.ability labelAttr="label" blank=""}}
    </select>
  </div>
</div>