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<?php
/** shorten text to a specified length and add ellipses
 ** may need adjusting if you need to support multi-byte characers
 ** https://www.php.net/manual/en/function.mb-substr.php
 ** https://www.php.net/manual/en/function.mb-strlen.php
 **/
add_filter( 'facetwp_builder_item_value', function( $value, $item ) {
    if ( 'el-ymud8n' == $item['settings']['name'] ) {
        if ( strlen( $value ) > 50 )
           $value = substr( $value, 0, 50 ) . " &hellip";
    }
    return $value;
}, 10, 2 );