In Chrome, goto the URL chrome://settings/passwords. Click the 3 vertical dots to the right of "Saved passwords" and export your passwords to a csv file. Then, open the csv file in a text editor to confirm your usernames and passwords for sites are listed in there. If so, you have a good csv file.

In Opera, goto the URL opera://flags/#PasswordImport, enable password importing and restart Opera. Then, in Opera, goto the URL opera://settings/passwords, click the 3 vertical dots to the right of "saved passwords" and import the csv file. Then, you should be good to go.