Blueprint - RuntimeFloatCurve Struct can t break or be edited?

hello
I m trying to dynamically modify / create a 2 points curve.
Both curveFloat and runtimeFloatCurve variables are available in BPs but I can t seem to find a way to access them in runtime (appart from reading the value of curvefloat over time).

Am I missing something ?
Thank you :slight_smile: