How to display a private Google calendar for unauthorized users (using the API)?

Question

Google

Good days. There was a need to display a private google calendar widget, with the ability to view it to unauthorized users. Please tell me how can this be done?
The bottom line is, there is a google calendar widget, you need to display and show information from it on a specific page of the site (with password access). The problem is that the private calendar cannot be viewed if you do not have access to it, the users themselves who should see it do not have google accounts, and there is no way to give them access to view the calendar. There needs to be some way to bypass this restriction and allow users to view the private calendar.
I thought to do authorization through the Google API, but in this case the user will be able to log into the account and manage both it and the calendar itself. In addition to this, I could not find information on hidden authorization.
Is there a proper solution for this problem?