Can an iPhone 6 Plus support the raise to wake feature?

This is a user forum, you are not addressing apple here  just  fellow users

only way to update ones ios device is Update your iPhone or iPad - Apple Support

you can try contacting apple Support ->  Get Support (apple.com)

According to this discussion in the Apple forums, iPhone 6 Plus does support raise to wake. The iPhone 6 does not.

Raise to wake option in iPhone 6. - Apple Community

To turn Raise to Wake on or off, go to Settings > Display & Brightness.

Please follow Rudegar’s instructions to make sure your iPhone has been updated to the highest iOS possible for that phone.