Hi @OAskarov, thank you for posting in our Community!
I want to share a resource I found "HubSpot removes from the request any traits that aren’t contact fields in HubSpot. To find out which fields you can set, navigate to Settings > Data Management > Objects > Contacts and select Manage contact properties under the Setup tab."
I recommend starting with that and connecting with Segment's support team if you need additional assistance in working with that as that is their integration.