Numbers cannot be imported to Sakari via the HubSpot integration.
US/CA landlines purchased from HubSpot can be added to Sakari via Hosted Messaging.
Numbers purchased from HubSpot for use in other countries can be ported to a number provider with which Sakari has a direct integration (e.g., Aircall, Twilio) and then imported to Sakari.
See also:
Add a HubSpot number to Sakari (US & CA only)
Hosting a number or porting a number?
Connect the Aircall integration