How to access session variables from subdomain

My content is on cdn.mysite.com to restrict access
Both my homepage mysite.com and cdn.mysite.com are static websites
mysite.com is made with Wappler and cdn.mysite.com has a html game (Made by Construct3) in each of its folders cdn.mysite.com/game1 cdn.mysite.com/game2 etc

I am not using any server components of Wappler on mysite.com as it’s a static site
I login the users on mysite.com and store the email id and a session id in session variables.
I want to access session variables in cdn.mysite.com to save game progress

How do i do that ? Construct3 supports custom javascript but i am not able to find any resources to understand how to access session data of mysite.com on cdn.mysite.com

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