iOS 14 - MFI hearing aids now playing all system sounds - separate volume control requested

System sounds, including notifications, are now optionally sent to MFI hearing aids.

(This feature previously appeared in iOS 13 and was removed in iOS 13.2.)

I now hear notification sounds much more surely than via the phone speaker.

I am grateful that this feature has returned, with a setting to Disable it for those annoyed by it.

Settings > Accessibility > Hearing Devices > Play System Sounds

However, the volume of the notification sounds via hearing aids is very loud.

Request - a setting to adjust Hearing Aid System Sound volume.

As a work around, lower volume notification sounds can be selected for each notifying app.