Add iCalendar "Conference" property to generated ics file. Event Espresso 4

ics_virtual_location.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_filter(
  'FHEE__EED_Ical__download_ics_file_ics_data',
  'my_custom_ics_virtual_location',
  10,
  2
);

function my_custom_ics_virtual_location(
    $ics_data, 
    $datetime
) {
    $event = $datetime->event();
    if($event instanceof EE_Event) {
        $venue = $event->venues(array('limit' => 1));
        if (is_array($venue) && ! empty($venue)) {
            $venue = array_shift($venue);
            if ($venue instanceof EE_Venue) {
                if (!empty($venue->virtual_url())) {
                    $ics_data['CONFERENCE;VALUE=URI'] = $venue->virtual_url();
                }
            }
        }
    }
    return $ics_data;
}