tasks RACE only high not "middle"

[Choi-jun9803]

I understand that the RACE task includes both ‘high’ and ‘middle’ levels.
In various papers, experiments are conducted separately on RACE-high and RACE-middle to measure performance.
However, in this package, only RACE-high is available, and RACE-middle is missing.
Is there a reason for this? Do you have any plans to add this task as well?