To import contacts from a CSV file into Google contacts, all you need to do is:
1) Go to Google contacts
2) Select "More" and "Import"
3) Choose the CSV file you wish to import and click on "Import"
This will import the contacts into your Google contacts account.
As long as this account is linked to your device or your Covve account, the contacts will be synchronized with Covve. They will then be deduplicated and enhanced.