The new API endpoint 'Get User Follows'
https://dev.twitch.tv/docs/v5/reference/users#get-user-follows

Could include more data than what is currently provided.
The legacy endpoint alternative offers a lot more but not all of this info is required by default.
https://dev.twitch.tv/docs/api/reference#get-users-follows

My suggestion would be to at least provide the 'notifications' as well as the 'logo' info. To keep the requests at an optimal size by default, extra request parameters can be given such as:

?showLogo=true&showNotifications=true
(which can default to false when not present)

or

?verbose=true
(which will provide an equivalent response to the legacy variant)

The new endpoint should also only show this extra info as long as the token provided belongs to the given 'to_id'. Otherwise everyone can see who has the notifications activated for which streamer