How to display a piece of html in edit SonataAdmin?

Question

symfony

In list and show, you can pass null as the second argument in $formmapper->add and then specify template in the parameters where the field value (in this case, there is a model) from the first argument will be passed. But if you do this in configureFormFields, then it starts to swear that you need to set the type. I tried to create a custom fieldType, but I can't pass the template there. It takes some default value:

public function buildView(FormView $view, FormInterface $form, array $options)
    {
        $view->vars['template'] = $options['template'];
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $options = [];

        $resolver->setDefaults(array_merge($options, [
            'template' => '',
        ]));
    }

On a good note, I would like to understand how to correctly pass a template into this type so that the type pulls it up and I can further use it in the admin panel when I need to display some kind of template.
But I have already killed a few hours on this and I would like to know in general how you can display at least some piece of html in the edit form