In a Brave Browser New Window, visit the specific website of interest - for example, the main Google website: https://www.google.com/. Click on the tune icon that is adjacent to the left end of the Brave Browser window’s URL address field:
In the resulting pop-down window, find and click on the Site settings button:
In the resulting Brave Browser Settings window, scroll down to JavaScript, and Allow that:
The base of the address is brave://settings/content/siteDetails?site=https%3A%2F%2F ← that is sort of a constant. The remainder of the address is either a domain name such as google.com or a hostname such as www.google.com.
I suggest, that you manually set JavaScript to Allow, for each of the following domains / hostnames of the Google Sphere / Google System: