abbreviation:
            template: '@ezdesign/fields/ezrichtext/custom_tags/abbr.html.twig'
            icon: '/bundles/ezplatformadminui/img/ez-icons.svg#about'
            is_inline: true
            attributes:
                abbreviation:
                    type: 'string'
                    required: true

<abbr title="{{ params.abbreviation }}">{{ content }}</abbr>