I made a specific Low Cadence post for reference:
SSB Low Vol Part 1 has a TON of workouts that you can add your own low cadence work. Part 2 is a bit tougher with the higher intensity workouts, but those can be done if planned well.
Just about looking at the work you want or think you need for your events. I do plenty of my own low cadence work in Endurance up to Sweet Spot work. Different intervals with it and mixed standing seated as well. Get creative and add what you want on your own.