Tips and tricks working with Form templates in S4 Public Cloud:

1. Downloading XML
1. In SD and some MM outputs, you could change the print queue to #&&DOWNLOAD_FORM_DATA_XML&&#.
2. In FI correspondence outputs, you might be able to enable option to download the XML by appending ?DownloadXML=true to the end of your browser's Fiori URL address string.
3. If else failed, you might be able to use debug sheet. Information can be found here: https://community.sap.com/t5/crm-and-cx-blog-posts-by-sap/debugsheet-get-xml-data-for-local-print-form-preview-in-the-adobe-livecycle/ba-p/14373340