This is according to several user reports on Reddit in which they have noticed an update to the Google Fi app that indicates that eSIM support for existing customers is now available. If you don’t see the feature available to you yet, some Redditors have managed to get it working by uninstalling and reinstalling the app, so you can give that a go if you’re interested.
eSIMs have been gaining in popularity due to their convenience. This is because unlike physical SIMs, new customers to carriers that support eSIM can sign up almost immediately online, where in the past customers would have to wait for the SIM card to be posted to them. It also helps free up a bit of space inside phones, making it potentially lighter and allow manufacturers in use that freed up space for other things.
As it stands, iPhones that support the eSIM format include the iPhone XR, XS, XS Max, 11, 11 Pro, 11 Pro Max, and the 2020 iPhone SE.