I'm just asking if there are wine shops or businesses that do this? It was offered in many wine shops in Italy and I'm wondering about the ability to do so in France (French laws).
Once you've bought the wine in the store, France has no more to do with you. You're free to drink or take abroad whatever you've purchased. Whether one can secure relief from the VAT one pays in the store is another matter; my past experience is that the juice may not be worth the squeeze. I anticipate purchasing a case or so of French wine and carrying it back to California in checked luggage. Total value is likely to be about 1,000 euros.
So far, for personal use, all I see is that we'll be responsible to the US government for about $1.75 per liter for quantities in excess of 2 liters (there's a duty free allowance of 1 liter apiece). So for 12 bottles at 0.75 liters apiece, we'll have to pay duty on 7 liters, or about $12. I've researched ttb.gov and can't find any additional fees we'd have to pay.
We're finding that the cost for wine shipped from France to the US is about $200 for the first case, and about $75 for each additional case. That of course differs from shop to shop. At those prices one had better be buying some pretty good stuff that's unavailable in the US. Older vintages (say 2018 and earlier) of Grand Cru Bordeaux qualify. The benefit of shipping from the retailer is that the VAT comes off the purchase price right away (at least it should).
I should note that we live in California. Other states have different laws that can change the economics or even prevent bringing the wines in legally at all.