Hi there,
Thanks for contacting WPML support and sorry for the late reply due to the higher queue on weekend.
WPML doesn't have an option for setting multiple domains to one language. This would require custom programming work which is beyond the scope of our support.
If you want, you can hire a professional developer who can help you to accomplish this requirement as per your needs. More information is available here: https://wpml.org/contractors/
A workaround is to create a custom language for each country, then you can set a different domain for each of those languages.