I am refering to this discussion started by Supriya Rajgopal on Drupal : https://www.drupal.org/project/h5p/issues/2772799.
It's a pity that the list of H5P contents which are available in Course Presentation is "hard-coded" in the CP files itself. In the Drupal discussion mentioned above, a workaround is given to hack CP to make the inclusion of extra content types. I have followed the instructions and it's working OK. However this hack cannot be considered a satisfactory solution.