What you would practically need to do it go to WPML > Settings > Custom XML config, copy-paste the code in the link below and then save the page: hidden link
After that, I would need you to go to the original/default language homepage, make a small edit (add a space or a letter that you can remove later - we need to do this just so that we can set the translation to the "needs update" status so that WPML can re-scan your homepage) and then save it.
Now go to the translation page and the new fields should show up for translation.
Please let me know how that goes and if you were able to translate the content.
If you still need help, please let me know.
I will be waiting for your response.
PS: Just a note that I won't be working on the weekend so I will be able to get back to you at the beginning of next week.