add_filter( 'gutenfactory_blocks', 'my_awesome_block' );
function my_awesome_block( $blocks ) {
  $blocks['arunas/my_awesome_block'] = [
    'name'          => 'My Awesome Block',
    'category'      => 'common',
    'style'         => plugins_url( 'my-awesome-block.css', __FILE__ ),
    'editor_style'  => plugins_url( 'my-awesome-block-editor.css', __FILE__ ),
    'callback'      => 'my_awesome_block_render',
    'fields'        => [
     // define the fields here.
    ]
  ];
}

add_action('acf/init', 'my_register_blocks');
function my_register_blocks() {
    // check function exists.
    if( function_exists('acf_register_block_type') ) {
        // Register a testimonial block.
        acf_register_block_type(array(
            'name'              => 'testimonial',
            'title'             => __('Testimonial'),
            'description'       => __('A custom testimonial block.'),
            'render_template'   => 'template-parts/blocks/testimonial/testimonial.php',
            'category'          => 'formatting',
        ));
    }
}

$banner = new StoutLogic\AcfBuilder\FieldsBuilder('banner');
$banner
    ->addText('title')
    ->addWysiwyg('content')
    ->addImage('background_image')
    ->setLocation('block', '==', 'acf/testimonial')
        ->or('block', '==', 'acf/anotherone');

add_action('acf/init', function() use ($banner) {
   acf_add_local_field_group($banner->build());
});

if ( function_exists( 'lazyblocks' ) ) :
    lazyblocks()->add_block( array(
        'title' => 'Custom block',
        'slug' => 'lazyblock/custom-block',
        'supports' => array(
            'html' => false,
            'multiple' => true,
        ),
        'controls' => array(
        	// define fields
        ),
        'code' => array(
        	// editor/frontend templates or callbacks, assets
        ),
    ) );
endif;