Description
Is your feature request related to a problem?
No
Describe the solution you'd like us to implement.
To add a command /boxed addborder 1 that command will add one more block (will have the same effect as completing an advancement)
Describe alternatives you've considered.
Giving custom advancements that are impossible? BUt that's too hard and it's not possible to make it infinite (Like to do shops for this)
Additional context