One random number for two parameters

[123qweas]

So I wanted to have one random number generated for the historySize and for the min_predictions (from neuralnet strategy).
I tried it with

predictions: [randomExt.integer(240, 1)]
getProperties: () => ({

min_predictions: randomExt.pick(config.predictions)
historySize:  randomExt.pick(config.predictions)
 })

It didn't work...
Both had the same random number but each epoch hat the same.
I think that the random number that is calculated ones stays the same for the whole time the config is executed.
Do one of you know a solution for my problem?
Thanks!

[raimannma]

getProperties: () => ({
    min_predictions: randomExt.integer(240, 1)
    historySize:  this.min_predictions
 })