This template has only one purpose: to render nvim-cmp plugins. Those plugins all work the same way: load a ~/cmp-{{srcname}}.json file from ~.
The srcmap parameter points to only root element in this JSON.
You will have to add this autocompletion {{srcname}} source to your nvim-cmp config manually.
Run this like this to setup _srname_ and _srcmap_ manually on plugin generation:
guic -R '<full path>/cmp-source/' '<full-path>/nvim-data/site/pack/user/start/'
Add a setup() function to pass a file path to it.