This feature request is a good one and has already been made here https://community.brave.com/t/scripts-are-only-allowed-once-why-not-remember-it-like-device-recog-and-cookie-settings/118661 and a couple of others, which you may upvote if you like.
There is no way currently for more granular permanent control of individual scripts, only the “Allow once” option. You would need the NoScript extension to achieve this.