ibexa_fieldtype_page:
    blocks:
        Accordion:
            category: default
            thumbnail: 'path/icons.svg'
            views:
                default: { name: 'Default block layout', template: 'template.html.twig', priority: -255 }
            attributes:
                group:
                    name: Accordion module
                    type: nested_attribute
                    options:
                        multiple: true
                        attributes:
                            text:
                                name: Text
                                type: richtext
                                validators:
                                    not_blank_richtext:
                                        message: 'Provide a value'