This is possible now. Use Format > Row > Task List to create a task with a checkbox.
I’m working on the infrastructure for these sorts of things in my 2.0 rewrite of Bike. They won’t all be possible day one of 2.0, but I expect will eventually be possible. Likely using a mechanism similar to TaskPaper… not much will be built in (except filtering), but you’ll be able to attach tags and values to rows and adjust row styling based on those values.