It is just an standard eUICC card with an issuer certificate, which means you need issuer's app to access low-level eUICC functions on a rootless Android. This is how esim.me enforces the subscription.
This also means, you can use any LPA implementation to manage and install profiles on your own!
This also means, you can use any LPA implementation to manage and install profiles on your own!
Some examples:
https://github.com/Truphone/LPAdesktop Needs a smart card reader and a pc to work
https://github.com/estkme-group/lpac Could either use a smart card reader or an actual modem with AT-support
https://gitea.angry.im/PeterCxy/OpenEUICC Needs a root on Android
Furthermore, I believe you could manage it via Windows settings if your window laptop has a WWAN card.