There sure is! It's just in the settings menu all the way down at the bottom. The default system one is the RTS chart.

There's also a custom rpe chart derivation tool that does a regression on your logged set history to come up with custom RPE charts scoped per-exercise and modifier combination, so you can automatically create custom RPE charts from your real historic performance for every single lift and variation.

Squat, paused squat, tempo squat, etc...all unique exercise/modifier combinations are override-able with a per-movement custom RPE chart