Hello Benjamin,
From what I understand, to reuse the H5P packages that you created and currently use via the mod_hvp (H5P plugin) in the new Content Bank, you can first download them (the .h5p file/s) then upload or create new ones in the Content Bank of your course. Then you should be able to add them into Moodle pages as you like.
I haven't had any experience with adding 3rd party JS libraries but doing a quick search pulled up the following for me.
Moodle docs - Javascript Modules
From what I understand, to reuse the H5P packages that you created and currently use via the mod_hvp (H5P plugin) in the new Content Bank, you can first download them (the .h5p file/s) then upload or create new ones in the Content Bank of your course. Then you should be able to add them into Moodle pages as you like.
I haven't had any experience with adding 3rd party JS libraries but doing a quick search pulled up the following for me.
Moodle docs - Javascript Modules
Moodle docs - Guide to adding third party jQuery for AMD
Moodle Forum post - Using third party JS in amd modules
Hope that helps,
Ben