how can I trigger callouts completion ?

[maosocial]

like:

1. input: [!
2. cmp: note important ...

[MeanderingProgrammer]

You need to start with a block quote, so input is > then you'll got various completions.

It currently stops working once you add the additional ], so > [ will not provide any completions. Open to improvements if you want to send a PR.