Filtering annotations based on the text they represent is very helpful in navigating to the desired annotation quickly. But currently, we cannot search through annotations like highlight, underline and squiggle based on their text content. I presume this is because the text that these annotations represent is not stored in the corresponding XML file and that storing it and making some modifications to the reviews panel will solve the problem.
Yes please, this is important to give a sense to annotations. I would also suggest to default that text to the original selected text (or at least a short amount), and display it directly in the annotation tree at the place of page number.