Create Internal Use Document Library in existing SPO Site and make it Unique Permission

Hi SPO / Powershell Community,

I'm looking for a Powershell script to achieve the need below in SPO Site in the process order below.

1) Get existing SPO Site URL

2) Create new Document Library with DocLib Name, Internal Use only sensitivity

3) Unique Permission for this new Document library in Point (2)

The Powershell script should ensure all the above process steps to be accomplished in one go when I run the script.

NOTE: Powershell script is the primarily expected solution. But, if alternative approaches are there in case of any shortcomings with Powershell script please feel free to suggest.

Your help is appreciated.

Thank You,

Arun