We will consider adding this feature in upcoming releases. Thank you for bringing it to our attention!

Please refer this: https://docs.servicenow.com/bundle/vancouver-api-reference/page/integrate/inbound-rest/concept/c_RESTAPI.html#c_RESTAPI__multi-factor-auth-inbound-REST

Internally when calling ServiceNow API the grant_type is set to 'password' (grant_type=password&client_id={client_id}&client_secret={client_secret}&username={username}&password={password}). Please check with this link: https://docs.servicenow.com/bun...

Yes it requires Client ID, Secret, Username and Password as per ServiceNow document. The access token is generated out of these input parameters and this token is used further.