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Unfortunately, this issue has been pending for a long time. And there is not much of a solution.
The archive field is the right one. You need to make sure that the data is correctly stored there and a JSON formatting is preferable, especially if you plan to use that information in velocity scripts.
- Flow steps to create/update/delete custom object instance
- Have extended Marketo Program member fields and use them to full power (with or without SFDC campaign member field sync)
Now, there might be some webhook solutions that can turn this into custom object entries. Look into Etumos' FlowBoost.