Hi @chinhd
Two ways to get these ID values:
Go to Settings->Properties->Contact Properties and search and click on the Contact Owner Property. On that screen, it will list your contact owners (users) and their internal value (user ID.)
You could also pull Hubspot user IDs using the Hubspot Owners API: https://developers.hubspot.com/docs/methods/owners/get_owners
Just enter https://api.hubapi.com/owners/v2/owners?hapikey=*yourapikeyhere* in your browser (replacing yourapikeyhere with your Hubspot API key) THis will list out your Hubspot users and their ownerId.