Hi @Angela
Based on my searches, it doesn't seem like an easy thing to do with multi-valued parameters in data-driven subscriptions.
If you only have a small number of subscriptions, it may be better to manually set the multi-valued parameter values.
But if you want to implement data-driven subscriptions, changing the default value or using delimited value strings may be the solution. I found these links for you, you can use them as a reference.
Best regards,
Aniya