Changing color of {{ form_help(‘from.name) }} (Symfony 5.2)

I have a simple contact form. Within the form I would like to change the color of the help text

In FormType I added i. e. the name field:

$builder
            ->add('name', TextType::class, ['help' => 'Pflichtfeld'])

In Twig I have this:

<div class="row">
    <div class="col">
        {{ form_label(ContactForm.name)}}
        {{ form_widget(ContactForm.name) }}
        {{ form_help(ContactForm.name, {'help_attr': {'class':'text-danger'}}) }}
    </div>
</div>

Sadly the class is just added to the existing class when rendering and therefore is ignored:

<small id="contact_name_help" class="text-danger form-text text-muted">Pflichtfeld</small>

What do I need to do that the class defined in ‘help_attr’ ist overwriting the existing classes and is not just added?

Is it because I use ‘bootstrap_4_layout.html.twig’ as a form_theme in my twig.yaml?

Help is really appreciated!

Source: Symfony Questions

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