Revising documentation about how to create a custom fields and CMB2 code I am trying to setup a plugin that renders html before and after of a field if this has a parameter(s) defined

I am trying to do the same that wordpress publishing actions form (before publish button) with any CMB2 field, the workflow is really easy but I need to find a way to add content before/after any field

The problem is there is any hook before/after a field, so at this moment is impossible to make work correctly this plugin

Can someone with more deep knowledge with CMB2 help me?