Passing custom classes on components block..

Hi there,

Components parameters are not allow us to pass a custom specific className, p.s: I don't want to pass the className inside the content....

.....
 blockManager: {
                   appendTo: '#blocks',
                   blocks: [{
                           id: 'header',
                           label: 'Header',
                           className: 'header',
                           content: {
                               tagName: 'app-header',
                               draggable: true,
                               components: [{
                                   tagName: 'div',
                                   content: 'This is the text inside ther header',
                               },{
                                   tagName: 'div',
                                   components: 'This is the main header',
                               }]
                           },
                           category: 'Headers',
                        }]
            },
......

Is there a way to do that ? Or we should build a plugin for that ?? Thanks !