Hi Brett,
Unfortunately, this cannot be done yet. We've created a feature request to add in that functionality, but it is up to the development team if it will or can be implemented. So, there is no guarantee and no timeframe.
I'd suggest for them to create a custom Primary Advisor and Secondary Advisor entities and add lookup fields to these entities onto the Account. That way, they can pull in all of the information because they are different entity types.
Let me know if you have any additional questions on this topic or if it's okay to close it.
Best,
Diego