Hi GiaoTran,
I’ve finished testing, but unfortunately, it seems this feature is not available for Excel for Mac at present. I’ve tested on the 16.29.1-16.33
versions of Excel on Mojave and Catalina, none of them have the Value From Cells option on the
Format Data Labels panel.
Really sorry for the inconvenience the problem caused, I would like to suggest you share a new idea in Feedback
by UserVoice of Excel for Mac, in the event other users are also having the same demand, they would be able to vote for your post. The more users vote, the more likely this feature
will attract developers' attention, it will benefit more users once this idea can be accepted by the developing teams.
If it's convenience, you can post the UserVoice link of the newly created idea here, other community members with similar needs can vote for your idea.
Thanks for your patience and understanding.
Best Regards,
Hugo