Lead magnet hosting – Squarespace and Hubspot

Hi, apologies for what is likely a pretty basic question.

My client is creating a range of 'how-to' guides as a lead magnet. Their mailing list is with Hubspot.

Where do I host the lead magnet? I know it can be added to a 'landing page' on Squarespace or one created with Hubspot. I'd prefer to create it on Squarespace as it will be on brand! But is that possible to capture email addresses?

Thanks in advance