Hi Line,
Thank you for posting your concern.
Unfortunately, the only available fields are,
from the Keywords Performance Report and any lower range CPC of a keyword are currently not supported in AdWords API. You may follow our blog for any upcoming features and updates.
Regards,
Hiroyuki
Google Ads API Team
Hi Line,
Yes, it is currently available only via the Google Ads UI.
Feel free to contact us again once you have any concerns / issues.
Regards,
Hiroyuki
Google Ads API Team