Hello Hamid-Reza,
Welcome to the community!
Unfortunately, I do not believe Fido offers any smartwatch plans at the moment. You might be able to activate the eSIM, however, it would require its own independent plan. It would not be an extension of your existing Fido number.
If you wish to attempt to obtain another line and eSIM for your watch, you could visit a Fido store or contact customer service to activate a new line and request an eSIM card (see here). In addition, they can also be contacted via Live Chat, Facebook, or Twitter. Those methods can be accessed via the contact page posted above.
On the other hand, if you wish to use the watch as an extension of your existing number, I think you would need to transfer your services to one of the other providers offering that service.
Hope this helps 😀
Cheers
