How you can help the community is well laid out in sticky post /forum/general/welcome-to-the-grav-cms-community-forums-t8083
Please update you post.
Btw. feature request should be made in the Github repository of either Grav, theme, or plugin.
But before creating a feature request, take a look at the docs and learn how attributes can be added when adding image/video in Markdown, how custom css can be added to a theme, etc.