I want to make a suggestion regarding the tft rewards progress bar

Apparently the rewards bar changed yesterday and i hadn't had the chance to get to the last arena layout

https://imgur.com/jPLwcLG

from what i understand, the opportunity is permanently lost.

So i've been thinking: why don't you guys (riot) implement a feature that says something along the lines of:

"if you get to the end of the tft rewards progress bar you may spend x ammount of tft essence (whatever it's called) to get a random reward you've missed on from previous phases. and for the ones who have everything already, a key fragment"

https://i.kym-cdn.com/photos/images/newsfeed/001/038/936/710.jpg