Add Custom Post Type Column to Guest Author User Lists

I had opened Issue and purpose of opening this issues **Add own custom columns to the guest authors list table**.
We are using plugin for editing default post type and Custom Post types.

We have a Custom Post types etc `Slideshows` , now guest author are being assigned to these Custom Post types , now we need to count total user's post in new Separate Columns say `Slideshows Posts`

how we can achieved this feature to Co-Authors-Plus Plugin , any thought and ideas ?

Please `help us to how we can achieve` or add new columns for custom post type so that we can see how many custom post are associated with guest author

The issue names no files, tests, or entry points. Begin by locating the guest-author user list and custom post type handling in the plugin; done means separate columns show the post count for each requested custom post type.

Written by the indexing model from the issue text.