For MacBook Air computers in 2017 and before 2017, you can use an OWC Envoy Pro Enclosure for your original Apple SSD. These enclosures are only made for an original Apple SSD. Apple SSDs use a proprietary Apple connector so OWC is your best option.
While for the MacBook Air computers released after 2017, there is no way to remove the internal hard drive.
Hope you good~