To enable this feature
Add the following line to your child theme's functions.php file:
add_filter( 'fl_enable_shortcode_css_js', '__return_true' );
You can use any shortcode, Beaver Builder or not, but we'll give you a couple examples that use Beaver Themer shortcodes very effectively.
You have CSS for a background image for a page, such as:
By using the Themer shortcode
[wpbb site:url] to replace your site URL, you
make it easier to migrate the code or the entire site to new URLs:
background: url("[wpbb site:url]/wp-content/uploads/2019/09/IMG_0346.jpg");
Here's a screenshot example of adding conditional shortcodes based on ACF custom field values.