Add wrapper div to Soliloquy caption

functions.php

<?php
//* Do NOT include the opening php tag

//* Add wrapper div to Soliloquy caption
add_filter( 'tgmsp_caption_output', 'tgm_custom_caption', 10, 3 );
function tgm_custom_caption( $output, $id, $image ) {
 
  return '<div class="soliloquy-caption-wrapper"><div class="soliloquy-caption"><div class="soliloquy-caption-inside">' . do_shortcode( $image['caption'] ) . '</div></div></div>';
 
}