Server Minigames like Legacy Minigames (i don't have name ideas)

In Minecraft Legacy Edition we had three minigames: Battle, Tumble and Glide.

In Minecraft Java and Bedrock we have public servers with too much more minigames, but we are forced to have the full inventory in minigames that only use one item. 

In Minecraft Legacy Edition the the minigames did not have an inventory and this was replaced by other things (for example in Glide it showed you how much was missing to finish). This would be very useful in minigames that only use one or two items

If you're asking about mobile players, then they should also enable the ability to add extra buttons for bonus items.