If you want to manage autofill rules from a central location, then you can import data from a remote CSV file. What if you don't have access to a server to host the remote file? In this case, I recommend using
Pastebin. Once you're logged in, click "new paste" and paste in the exported Autofill data. Click the "raw" link to get the remote file URL. For example, try importing the test data from here:
https://pastebin.com/raw/k5j87pZB.