Adding a plane surface to a 3d scatter plot (R)

Hello everyone,
I created a 3d scatter plot using plotly and I would like to add a custom made plane surface to the plot. I don’t want it to be related to my data. I just want to manually add it and change its position and inclination in the graph. Are there any commands I could do that?

I have tried using the code for the regression plane (Adding Regression Plane to 3d Scatter Plot in R) but a regression plane is not what I need in my plot.

Thank you very much!