Create Sequence Keyframe @ Runtime

We are looking for a way to add a keyframe to a sequence based on a user’s camera placement in a runtime build. The user would move to the view they want, and then click a UI button to set a keyframe in the sequence track for the camera. Does anyone know of a way to do this in BP or even in C++?
Thanks for the help!!

Up !
Have exactly same need and found nothing relative to this kind of feature at runtime.
Even for timelines…
Anybody has managed to add actors and add keyframes to Level sequence at runtime ?