Library/Script dependency in Custom action

what library you would like to add, maybe it is preloaded already?

You have 2 methods, either search via bar and click add that will work for the most common one, or you can use + sign to improt it

For importing based on documentation:
https://docs.cloud.google.com/chronicle/docs/soar/respond/start-developing/my-first-integration#creating-your-first-custom-integration-in-the-ide
Note: Script dependencies are Python libraries that your custom integration must import. You can add them in formats, such as Wheel files (`WHL`), tarballs (`TAR`), Gzip archives (`GZ`), or Python files (`PY`). Each integration runs in its own virtual environment, letting you include specific library versions even if a different version is already installed on the system. For example, if you need a particular version of the requests library, download it from a trusted source (such as PyPI or GitHub) and add it to the script dependencies. If the dependency is not in the virtual environment, the integration uses the system-installed version instead.