How to check folder exists in SharePoint Online document library using pnp script

I have an excel file having sample data as shown below

FolderName       Coulmn1   Column2

folder1                  raj            toshiba

folder2                  kumar         HP

i want to check with SharePoint documnet library if the above folder  name exists if it exists then i need to update columns1 and column2 values in the document library using PnP script.

How can we achieve this?