Even though each component is independently source-controlled using Bit, the entire workspace (i.e, the project) should be source-controlled with git.
Once you do that, you can modify the components in your own [git] branch, and add a “soft tag” which is a suggestion for a new component release version.
Once the workspace repo is pushed (e.g, to Github) you can have others review your code before the component is released with a new version and exported to its remote scope.
The information regarding the suggestion (to tag the component with a new release version) is stored in the .bitmap file. That allows your CI to use Bit commands to accept the suggestion, tag the component, and export it.