[Notification] Stripping HTML from Post Content Merge Tag

functions.php

<?php

use BracketSpace\Notification\Defaults\MergeTag\Post\PostContent;
use BracketSpace\Notification\Defaults\MergeTag\Post\PostContentHtml;

add_filter( 'notification/merge_tag/value/resolved', function( $resolved, $merge_tag ) {

    if ( $merge_tag instanceof PostContent || $merge_tag instanceof PostContentHtml ) {
        $resolved = strip_tags( $resolved );
    }

    return $resolved;
    
}, 10, 2 );