Use esim directly with Watch 4 4g?

[mhs81]

I'm wondering if it's possible to use an esim directly with the watch 4 4g, instead of having the esim also installed in the phone?

I read somewhere else on the internet (https://forum.xda-developers.com/t/galaxy-watch-3-on-vodafone-uk-pay-as-you-go-how-to.4190629/) that this is possible but the instructions didn't really make sense to me. I wonder if anyone has managed to do it?

This would be great as it would save quite a bit of money as most of the mobile operators charge extra just to share data to the watch.

Most of the instructions show that you need to activate the esim on the phone first but surely there must be another way.