Populate a multi-valued active roles sync

Hello ARS Experts, I have a need to create a virtual multi-valued attribute and have it populated from a database. I use ARS Synchronization to sync some values already from this table but this new one I'm not sure if it is possible.

The SQL column will contain something like one;two;three. How can I populate the multi-valued virtual attribute properly to have each one of the values delimited in the column from the DB?

Thanks for any help in advanced.

Lu