You need to prepare an eSIM card reader, which can be purchased at https://esim.xcard.plus/en/buy.html.
If you need to write eSIM profiles directly on Linux or through a web browser, it generally means you are already an advanced user. We recommend using the following open-source tools directly:
https://github.com/iebb/NekokoLPA2
https://github.com/EsimMoe/MiniLPA