Same here too. I wrote twice to SQ during last summer 2020 right after the Privacy Shield cancellation. They told me there were reflecting on it but no news since... hope they will hear us all.
I have created new ticket by email to squarespace due to the urgency to provide with this option in the cookies of the website. I am asking for support as I have seen that the https://support.squarespace.com has the cookies options we need based our clients attorneys and the European regulations. I have asked to provide with a solution same as they have implemented for their website: support.squarespace.com
We need to give the option for users to select: required cookies / functional cookies / advertising cookies (in/out)
Here you can see the screenshot: