Low Events and Freeform - populate checkbox group from channel info

I am using Freeform Pro. I want to ask our festival volunteer candidates what shifts they would like to work at the venue gate. I have a channel called Gate. Fields: shift_time (fieldtype - Low Event); volunteers_needed (fieldtype - integer); etc.
In Freeform I would like to populate a checkbox group with the channel field info found in {shift_time}. I can do this but the output is not formatted as desired. Is there a Low Events fieldtype for Freeform?
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