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It is not currently possible to import notes into the feed using Hubspot native CSV import (discussion on importing notes in Hubspot Community).
You would need to use API or a 3rd party tool to import your notes from CSV, such as Import2 Wizard.
To start with, you can export Notes from within Pipedrive into a CSV. From your Pipedrive account, head to Settings > Export data > Select period> Export notes (please note you have to be an admin to do that)This way you will have a CSV file with notes.
The steps to import notes using Import2 Wizard are pretty quick:
1. Upload your CSV file, select “notes” as the type of data to import
2. Map the fields you want on the note itself (i.e. body/description of the note, timestamp) and the links to the records you want to associate the note to (i.e. contact, company, deal). You can use contact email for example to find the Sure there is an existing contact in HubSpot to link it to (you don't have to use email, you can use any field on the contact, even custom ones)