Adding Custom Tag control in Heading element

bu_heading_element_controls.php

<?php //* do not add this line
/**
 * enter the code into the functions.php file
 */

add_filter( "bricks/elements/heading/controls", 'bu_filter_heading_element_controls' );
function bu_filter_heading_element_controls( $controls ) {

		$controls['tag']['options']['custom'] = esc_html__('Custom');

		$inserted['customTag'] = [
			'tab'            => 'content',
			'label'          => esc_html__( 'Custom tag', 'bricks' ),
			'type'           => 'text',
			'inline'         => true,
			'placeholder'    => 'div',
			'required'       => [ 'tag', '=', 'custom' ],
		];

		$pos   = array_search( 'type', array_keys( $controls ) );
		$controls = array_merge(
			array_slice($controls, 0, $pos),
			$inserted,
			array_slice($controls, $pos)
		);
		
		return $controls;
}