Hello,
I'm happy to announce I've just started developing a plugin to easily use ALL the Bootstrap elements in the Grav way.
For example, to define a carousel, in your page header just add this definition:
gravstrap:
carousel:
carousel1:
id: bscarousel
previous_label: Previous
next_label: Next
items:
0:
image: image1.jpg
caption: an awesome image
1:
image: image2.jpg
caption: another awesome image
and render it in your twig template as follows: