How to send additional information (fields) from salesforce campaign association

We have data in one CDO (which is retrieved from GoToWebinar attendance) - which contains registrant key.

Based on the attended status, we are updating the campaign member status to "Attended" from Salesforce campaign association step.

We also want to send attendance time and registered date fields to salesforce campaign member. However, the salesforce campaign step doesn't have that option and the data retrieved from GoToWebinar doesn't contain the Salesforce Campaign Member ID.

Is there any other option to update this in Salesforce campaign?