Only the s10 and note 10 series have wireless powershare.
The Note 8 is on the list of devices that can RECEIVE a charge using wireless powershare from a s10 or note 10...
But the Note 8 will not charge other devices since it doesnt have the necessary hardware.
Charging smart accessories with Wireless PowerShare
Assuming your Galaxy S10e has sufficient battery and you need to charge your smartwatch or other smartphones that are capable of wireless charging, here’s how you enable the feature: