Find Frequency of specific character?

I’d like to be able to Find the number of times a specific character appears in my project.

I’m trying to count the number of annotations, and they all start with “{” so it would be easy if I could count that character.

If the Find command included a “total number found” that would be simple. Adding a custom character query to the Word Frequency tab under Documents/Statistics was the other place I looked, but a number option when I Find might be simpler?

I posted this as a question over here but it may not be currently possible, so here’s a request.
https://forum.literatureandlatte.com/t/find-number-of-times-some-text-appears/36798/1