[FlexMatch] Can we define comparison rule expansions by comparing attribute across player ?

Hello Flexmatch Team,

I didn't see anywhere mention that we could define relaxations on the comparison rule type by comparing the attributes of the players between them. For instance, in the rule DifferentCharacter in example 6, i would like to authorize an amount of duplicated characters according to the waiting time , like described below :

{
        "target": "rules[DifferentCharacter].maxCount",
        "steps": [{
            "waitTimeSeconds": 30,
            "value": 1
        }, {
            "waitTimeSeconds": 60,
            "value": 2
        }]
}

Thank you !