I would also love to see an Admonition plugin coming to life 
!
Here are other examples, in case one of the experts have to time to take a look at this 
:
- Admonitions | Docusaurus ( GitHub - elviswolcott/remark-admonitions: Add admonitions support to Remarkable )
- Admonition Plugin for Inkdrop ( GitHub - libeanim/inkdrop-admonition: An Inkdrop plugin that allows to add block-styled side content to your notes. )
Somehow, I thought this could be achievable solely from CSS, like the Kanban boards in the wonderful Spectrum community theme 
… But, as my CSS is really rusty, I probably won’t be able to help there 
.