I didn’t think it was possible with just a function. I’ve just been editing/creating the template files for it.
So in your child theme folder create a sub folder called woocommerce then another sub folder called single-product then inside that another sub folder called tabs.
You can duplicate the files over from the woocommerce plugin, it follows the same file suture. And rename one of the duplicates to your-tab-title.php and there you can pull the data in from ACF.
Also dupliate the tab.php over and add in the new title for that tab too in there
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