How to debug azure-functions-powershell-worker on local machine?

From readme, it mentioned "The PowerShell worker alone is not enough to establish the functions app, we also need the support from [Azure Functions Host](https://github.com/Azure/azure-functions-host). You may either use a published host CLI or use the in-development host. But both of the methods require you to attach to the .NET process if you want a step-by-step debugging experience."

But how to start the worker and attached to the process?