Excellent - 5
Good - 4
Average - 3
Below average - 2
Poor - 1
This would allow, for example, when challenging a clan to a clan war, to objectively find a suitable opponent based on their skill level.
And also, clan leaders sometimes take weak players into their clans, but this way, they will definitely find out.
It would be good to make this suggestion a rule, but for now, I ask clan leaders to indicate the skill levels of clan members on a voluntary basis.