prefix_display_link_to_account_page.php

<?php
/**
 * Display a link to the My Account page under upload fields
 */
function prefix_display_link_to_account_page( $item, $id, $group_layout, $file ) {
  $page_id = get_option( 'woocommerce_myaccount_page_id' );
  if( ! is_user_logged_in() && $page_id && isset( $item['field_type'] ) && $item['field_type'] == 'upload' ) {
    $url = get_permalink( $myaccount_page_id );
    printf(
      '<p><a href="%s">%s</a></p>',
      $url,
      'Click here to log in'
		);
  }
}
add_action( 'pewc_after_include_frontend_template', 'prefix_display_link_to_account_page', 10, 4 );