Seperate 2 devices on same apple ID for seperate set up of screentime for child

I have just bought my 12 year old a Macbook air for secondary school. She can't have the same screentime settings as her iphone as school has different requirements. How do I have 2 types of settings for the 2 devices (iphone & Macbook air)? These are both running on the same apple ID. Thanks Julshez