Custom World Border Increasing Idea

So I thought of an idea of people's xp levels based on what they are it will set the border size. Now I know this has already been done before with just increasing xp levels increases the border, but instead this would be just set and stone whatever xp level you have is the border size like 5 levels would be 5 blocks. The difference here is also based on how many people you play with their xp adds on to the border also if someone had 5 xp levels and you also had 5 xp levels it would make the border 10 blocks big. Now if someone dies and loses their xp levels it would decrease the border back to whatever the new total is for xp levels. This could make some interesting gameplay and I am just curious on what commands and ways I could try implementing this into a datapack as im not very experienced in it.