Yes, you can use your eSIM’s internet data on other devices by creating a personal hotspot.
On iOS, you can do this under the “Personal Hotspot” menu under settings and on Android, you can do this under the “WiFi hotspot” settings.
How do I check which eSIM is being used for my data?
Go to Settings > Network & Internet > Mobile Network
Here, you’ll see the name of the eSIM which you had set up during installation.
Go to Settings > Cellular or Mobile > Cellular Data
You’ll see “On” next to the name of the eSIM being used.
On Samsung Devices:
Go to Settings > Connections > SIM Card Manager
Under preferred SIM card, you’ll see the name of the eSIM under use