WP - Genesis - How to get the content of a widget in php?

Provided I have a widget area that I register in genesis like this:

genesis_register_sidebar( array(
    'id'        = 'my_header',
    'name'      = __( 'Image Header', 'my_header' ),
    'description'   = __( 'do it', 'my_header' ),
) );

and that I add as this

add_action( 'genesis_after_header', function() {

    genesis_widget_area ('my_header', array(
        'before' = 'div class="my_header"div class="my_wrap"',
        'after' = '/div/div',
    ) );

} );

Then, the user adds 3 text widgets inside the widget area, the question is how can I get the content of this widgets so that I can format them?

Something like this

add_action( 'genesis_after_header', function() {

    the_widget('WP_Widget_Custom_HTML', array(
        'content' = '
        div
            div $my_header[text_fields][0].textContent /div
            div $my_header[text_fields][1].textContent/div
            div $my_header[text_fields][2].textContent/div
        /div
        '
    ));
} );

NOTE: I've also asked this in stackoverflow https://stackoverflow.com/questions/53139436/wp-genesis-how-to-get-the-content-of-a-widget-in-php, are these two the same community or they do target different publics?