May site collection admin enable the custom script in SharePoint online site

Hi RamBhajan,

i am afraid that will not be possible. 

See here: https://learn.microsoft.com/en-us/sharepoint/allow-or-prevent-custom-script 
"As a Global Administrator or SharePoint Administrator in Microsoft 365, you can allow custom script as a way of letting users change..."

Disabling this feature requires admin access as the intent of disabling custom scripts are security reasons. Every custom script on a page will be executed as the current logged in user and might access more information than what is stored in the current site collection. So if a site collection admin could disable that feature then the scripts could do damage in other site collections. (Where another SCA is responsible and might not want that.)
So a SharePoint Admin needs to trust a SCA and then disable that feature for that site.

If an SCA could do that himself then this feature would be useless.

Best Regards,
Sven