Gopoacha25 Hello.
Sorry, it’s not free. You have to buy a ticket from the airport to the border station of Cantello Gaggiolo.
You can buy it on sbb.ch or in SBB Mobile app, but it is not a good idea to buy it in advance, the ticket is valid only 4 hours and will be no more valid if you flight is late.
If you want to buy the ticket in advance, buy it in the Trenitalia mobile app on your smartphone. An online check-in is necessary, but you could change the selected train if you are late before the check-in.
You could also buy the ticket at the airport station. These tickets must also be validated before boarding the train.
https://www.youtube.com/watch?app=desktop&v=ja7EotElSUc