Click the 3 dots above the password section and select “import passwords”. Then browse to the CSV you exported in step 7.
Nothing will happen, but if you exit and reopen Chrome and go back to password settings, the passwords should all be there.
Open Safari, click file and import from Google Chrome. Select passwords.
Now all your passwords are in Safari and if you wait a bit they will appear in Keychain.
Note: Once imported into Keychain, there doesn’t seem anyway to export them out (If you decide to go to another password manager). However, I imagine you could probably import from Safari to Edge and then use Edge’s options to export them as a CSV.