Submit form with Multiple checkboxes

Hi guys. Help needed.
We have form with multi checkox field registered in Hubspot forms.
Now i need to submit this form using submit api:
https://legacydocs.hubspot.com/docs/methods/forms/submit_form
Sending regular fields like firstname, lastname, phone, emails is ok.
But got stuck with sending multiple checkbox field values.
Didnt find clear answer in docs.
Help guys, thx !

for multi checkboxes you have to send all values concatinated with ; as string. E.g “a;b”