[QUESTION] How to change <a> content in traits?

I'm re-declaring a link type like this:

domComps.addType('link', {
    model: linkType.model.extend({
        defaults: Object.assign({}, linkType.model.prototype.defaults, {
        traits: [
            {
                label: 'Título',
                name: 'title',
                placeholder: 'Título'
            },
            {
                label: 'Link',
                name: 'href',
                placeholder: 'http://meusite.com.br'
            },
            {
                label: 'Descrição',
                name: 'content',
                placeholder: 'Botão'
            }
        ],
      }),
    })
});

When my button (<a>) is created, it is creating like this: <a class="btn botao-roxo">Botão</a> I would like to know how can I change the content of this (Botão) in traits.