You could either draw the automation in the midi file, or assign the pitch wheel to a midi controller and write the automation on the track, or bounce to audio and put on a pitch shifting plugin and automate that.
This is drawing the automation in the midi file.
You can control the over all amount of bend by clicking on the mod drop down and moving the slider to the amount of notes you want it to be able to bend it.
You can bend it up to an octave, but don't do that haha.