Default value based on current_user data

Before known this plugin, I was coding into functions.php file inside my theme directory to manage the checkout fields, adding a filter like this:

add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields' );
function custom_override_checkout_fields( $fields ) {
    //do things with fields
    ...
    
    return $fields;
}

But this plugin is way more intuitive, I want to use it! But I have one question:

Can I add default value to the billing_first_name which will be based on wp_get_current_user(); ?

On my custom code I mentioned before, I was able to do this:

$current_user = wp_get_current_user();
$fields['billing']['billing_first_name']['default'] = esc_html( $current_user->user_firstname );

and it worked very well.
But I want to get rid of my code and use only this plugin, can I add these “dynamic” default values?