Requiring more items the more times you do a challenge

[Minetown]

Description

Is your feature request related to a problem?

Our server will be switching over to BSkyblock from uSkyblock. However, one feature that seems to be missing in BSkyblock challenges (along with #76) is the ability to require more items the more times you do a challenge. For example, in the cactus challenge - requiring 16 extra cacti each team you do it. 64 the first time, 80 the second time, 96 the third time, and so on.

Describe the solution you'd like us to implement.

This is formatted in the uskyblock config as item:initialrequirement;+<# additionally required>. So the cactus challenge would be CACTUS:64;+16
It would be incredibly useful if this was implemented in some way in bskyblock challenges. It would allow us to feel more comfortable giving out larger repeat rewards, if the challenge gets progressively harder the more times you do it.

Describe alternatives you've considered.

Possibly adding a way to manually input the rewards for a specific time doing it. Instead of inputting a general "repeat item rewards," adding a way so that the 2nd time gives you X, 3rd time gives you Y, 4th Z, and then a general "repeat item rewards" after that.

Additional context

I believe the data for this is stored in uSkyblock in the individual player files