I was solving a similar problem, trying to reference a current properties in the property definition object. In the first example in these docs the options field is built from an anonymous function, what the docs don't say is that this function receives the scope object as single parameter, so you can do:
...
options:
function (scope) {
console.log(scope.yourCustomProperty)
},
...
hope that helps..
thank you to konrad.mattheis on the slack channel for pointing me to the answer!