Importing and Exporting JSON from Chrome to Brave in a Chromebook

I moved to Brave a few hours ago and had my bookmarks copy-pasted here in a tedious way, but there were only 7 bookmarks, I customized everything to dark mode, I have yet to add back my extensions, I have a JSON file I want to import here to the Diary extension I had added here, When I tried to import it here a thing like the Files Manager popped up but way more complex. I do not know what to do with this, I tried to put the Files Manager where I put the JSON file to a random file there but it did not work, I am a Tech Person but by not much, I need some help over here.