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Hi there,
Thanks for your contact, and welcome to the WPML support forum!
Unfortunately, we don't have a native feature for this and therefore it's not possible to achieve it without custom code. When the fields are created, there is a setting to adjust the translation preference, but if you have installed the ACFML later, then you need to edit each field.
As I said, it would be necessary to configure it with some code customization. I'm afraid it would be beyond the scope of this support forum but we recommend that you check our contractors page: https://wpml.org/contractors/.
Alternatively, please feel free to request this feature at the link: https://wpml.org/suggest-a-new-feature-for-wpml/. We will analyze it and upon further check, it can be available in the future versions of WPML.