{% set entity = ea.crud.currentEntityInstance %}
{% set current = entity.headers ?? null %}
{% set prefill = current is iterable ? (current|json_encode(constant('JSON_PRETTY_PRINT') b-or constant('JSON_UNESCAPED_UNICODE'))) : (current ?? '') %}

<textarea name="headersJson" rows="6" class="form-control" style="font-family: monospace;">{{ prefill }}</textarea>
<small class="form-text text-muted">Laissez vide pour conserver la valeur actuelle.</small>