I purchased the pro version hoping that I could add a ACF image field into a grid item layout but when I enter a meta key I am returned the image id.
Welcome to our forum.
I have created documentation for using ACF meta field via shrotcode on layout editor much easier to work, you will jusy need to create a shrotcode and add the code under theme functions.php file and you can use that shortcode on layout editor.
Please see the documentation,
hope that solved your issue.
Let me know if you need more help.