How to turn link an eSIM on Apple Watch Series 6?

Hello,

I am currently waiting for a cellular data carrier switch (Virgin to O2), and I wish to link my Apple Watch Series 6 with my cellular plan, but I don’t know how to do it!

Could someone please help me to answer this problem?

Thank you

My move to O2 will complete in 4 days (1st October 2023) from the day this was posted, and I would like to get the instructions on how to link my Apple Watch 6 to the same Data plan as my iPhone 13 i