Cross-platform Minecraft v1.2.1 - Cannot adjust "Gamma" video settings

• * * I do not know if this is the correct Bug Tracker for the new cross-platform Minecraft that was relased on 09/2017. If this is not, please direct me to the correct URL and I will gladly open a ticket there. Thanks. * * *

In the XBox 360 and XBox One Editions we are able to adjust the "Gamma" in the Graphics settings section (in addition to the brightness). I cannot locate this feature in the new cross-platform edition (even under Advanced Settings).

Also, it would be extremely helpful if the Gamma settings were a user-profile level setting (like the HUD opacity).