How can I allow a few HTML tags to excerpt?

I using this

[rpwe limit="10" cat="9" 
post_type="post"
post_status="publish"
ignore_sticky="1" 
link_target="true"
post_title="true" 
date="false"   
thumb="true"
thumb_height="240"  
length="50"
excerpt="true"  
thumb_width="300" 
thumb_default=""
readmore="true"
readmore_text="Detaljnije"]

and it works great. But I need to format the excerpt.

With this code below in my function.php I have HTML tags for every excerpt, but not for this plugin.

// excerpt filter
function custom_tptn_trim_excerpt( $text, $id ) {
	$raw_excerpt = $text; 
    
	$text = get_the_content( null, false, $id );

	$text = strip_shortcodes( $text );

	$text = apply_filters( 'the_content', $text );
	$text = str_replace( ']]>', ']]>', $text );

	/***Add the allowed HTML tags separated by a comma.*/
	$allowed_tags = '<br>,<p>,<i>';
	$text         = strip_tags( $text, $allowed_tags );

	/***Change the excerpt word count.*/
	$excerpt_length = 60;
	$excerpt_length = apply_filters( 'excerpt_length', $excerpt_length );

	/*** Change the excerpt ending.*/
	$excerpt_end  = ' <a href="' . get_permalink( $id ) . '">&raquo; Continue Reading.</a>';
	$excerpt_more = apply_filters( 'excerpt_more', ' ' . $excerpt_end );

	$words = preg_split( "/[\n\r\t ]+/", $text, $excerpt_length + 1, PREG_SPLIT_NO_EMPTY );
	if ( count( $words ) > $excerpt_length ) {
		array_pop( $words );
		$text = implode( ' ', $words );
		$text = $text . $excerpt_more;
	}
	return apply_filters( 'wp_trim_excerpt', $text, $raw_excerpt ); 
}
add_filter( 'tptn_excerpt', 'custom_tptn_trim_excerpt', 10, 2 );

Can I put some filters here or have anybody idea how can I allow these HTML tags for excerpts with this plugin?

Thanks a lot for your time