Bedrock Addon Inventory Tabs API or JSON object

Hello, I was working on a minecraft bedrock addon today and thought it would be neat to have custom additive equipment and cosmetics, however without replacing the existing armor in the slots. If we could perhaps have inventory methods in the scripting api, eg 

var newtab = player.inventory.CreateTab(int tabId, texture tabIcon);
newtab.slot(enum SlotType, stringArray [ string AcceptableItemTag ]);

or perhaps a json object for creating inventory tabs would be more "in line" with the current addon making process. 

This is currently my only suggestion for the addon api, as i would love to be able to make attachables that dont use existing inventory slots (although it should be noted that obviously this wouldn't be the only thing possible with this, perhaps if you take the JSON object approach one could be able to edit the tab's gui itself in the resource part of the addon).