You can ! I've found workaround for this!
** i'm considering you have no bookmarks in your opera account already.
You need root and following apps installed
Root explorer ( i prefer Es explorer)
Opera for Android
Chrome
Once you're logged into your google account on Chrome, make sure your bookmarks are synced. Close it!
Open root explorer and goto
/data/data/com.android.chrome/app_chrome/Default/
Copy Bookmarks and paste it into
/data/data/com.opera.browser/app_opera/
Delete Bookmarks.bak and open Opera for Android, voila!