Hello Michael,
The Google Ads API will have the same feature parity as AdWords API. This feature about sharing the MCC level negative criteria to all the sub-accounts is not supported in AdWords API, and is not yet available in Google Ads API too. Please keep an eye on our
blog for details on upcoming releases.
Thanks,
Bharani, Google Ads API Team

ref:_00D1U1174p._5001UCaWG5:ref