Hi Nayeem,
Lead form extensions are asset based extensions and you should be able to create this via the Google Ads API.
Here is an example on how to create the said extension. That said, could you clarify what you meant by your statement "..
directly from my UI and not from Google Ads UI"?
Best regards,
 |
| Peter Laurence Napa Oliquino |
| Google Ads API Team |
|
|
| |

ref:_00D1U1174p._5004Q2JWyfY:ref