Within the inputs parameter, -i in the example that you have posted, we can pass any file path. By default this is set to ../out/*-abi.json and above you have set it to ./abis/*-abi.json.
The asterisk * is denoting a non recursive wildcard search, so within the ./abis directory, all file name instances that end with -abi.json will be returned.
This wildcard search can be altered to return all instances of ...abi.json with the following path: **/*abi.json .