Short answer
HubSpot's KB: form submission conversion events sync contact data from HubSpot forms to Google Ads, and lifecycle stage events use Google's Enhanced Conversions. Only lifecycle changes after you create the event count. Marketing Hub Starter allows five events and Professional 50. Manager (MCC) accounts can't sync through Enhanced Conversions.
1. Connect first
Ads settings in my demo portal.

2. Click IDs
See GCLID in HubSpot.