Thank you for your post, @AmirBest!
Unfortunately, there is not an option to bulk import custom attributes. This does have to be done manually at this time.
It looks like this is a Feature Request currently. Please feel free to add your interest in this function to that thread and hopefully that can help our project managers get that implemented.
Please let me know if you have any other questions in the meantime.
Sammie_C
Community Moderator, US, Square
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