Updated: The ability to add custom attendee fields to WooCommerce order emails was implemented in May 2021.
Edit your event and go to the Product Data tabs > Event Settings and enable the following options as needed:
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To provide the best user experience, we use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us to process data such as browsing behavior or unique IDs on this site. Not consenting or withdrawing consent, may adversely affect certain features and functions.