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

<div class="form-group">
    <label>{{localize 'DND5E.HitPoints'}}</label>
    <div class="form-fields">
        {{numberInput system.hp.value name="system.hp.value" placeholder="0"}}
        <span class="sep">&sol;</span>
        {{numberInput system.hp.max name="system.hp.max" placeholder="0"}}
        {{numberInput system.hp.dt name="system.hp.dt" placeholder=(localize "DND5E.Threshold")}}
    </div>
</div>

<div class="form-group">
    <label>{{localize 'DND5E.HealthConditions'}}</label>
    <div class="form-fields">
        <input type="text" name="system.hp.conditions" value="{{system.hp.conditions}}">
    </div>
</div>