Make Custom Opportunity Fields Visible on Opportunity Info Tab

We need to see our custom opportunity fields on the opportunity info tab. The information is only available now inside of the Activity Log of a record in Marketo within the Add to Opportunity or Update Opportunity activities. We had to create custom fields for our CRM opportunity owner and opportunity created date since they do not sync with the Bedrock mapping. These fields are accessible if you have Salesforce but it is not practical if you are integrating any other CRM through a web api that requires custom fields.