You will need to use custom PHP code to create a shortcode which you can use with Elementor Shortcode widget.

Step 1: Add meta field for custom code

Add a Textarea meta field for the custom code in your custom post type. You can use any name/ID for this meta field. "booking widget" meta field name is used for this example.

Step 2: Add custom PHP code

In Appearance > Theme File Editor > functions.php, add this code:

add_shortcode("booking_widget_shortcode", function(){
return get_post_meta(get_the_ID(), 'booking widget', true);
});

Note: Double-check that the quotation marks (" and ') are correct. The text inside between the quotation marks will turn red if it's right.

Step 3: Add code in meta field

Add the code to the "booking widget" meta field.

Step 4: Add shortcode in template

In your template, add an Elementor Shortcode. Use the name of from the PHP code for the Shortcode widget.

Example:

Port massage > Treatments
https://abc10631.sg-host.com/behandelingen/prenatale-massage-copy-2/