How do I setup so that keyboard types replace placeholder text in snippets?

[comiluv]

First I hope this is the right place to post questions/feature requests.
I want to setup coq_nvim so that when the cursor is at the placeholder text in snippets, sequential keyboard typing would replace the placeholder text.
Below is an example screenshot.

coq_nvim_capture.mp4

in the main() function, I type std::vec and it brings up the pop up menu.
I then type <C-n> and <C-y> and then continue to type std::string.
But as I type std::string, the placeholder text, in this case class Ty is not replaced by the typing.

I would like to setup coq_nvim so that when I type when the cursor is on the placeholder text and with the placeholder text highlighted, the placeholder text to be replaced (deleted).
If this functionality is not implemented, I'd like to make a feature request.
Thanks for reading the issue.