Can i get direct folders that are under a parent folder using Get-PnPFolderItem

[mvcsharepointdev]

I have a SharePoint online document library which contain the following:-

Site url = /sites/Clients/

Document library = Customer Share

Main Folder name = Clients

now i want to get all the Direct folders that are under the Clients main folder, is this possible.

I have this PnP Power shell, but this will list everything inside the document library

$mainfolderUrl = "/sites/Clients/Customer Share/Clients"
$listName = "Customer Share"



Connect-PnPOnline -Url $SiteURL -Interactive
##$customerFolders = Get-PnPFolderItem -FolderSiteRelativeUrl $mainfolderUrl -PageSize 1  -ScriptBlock {}

$customerFolders= Get-PnPListItem -List $listName -FolderServerRelativeUrl $mainfolderUrl -PageSize 1  -ScriptBlock {} | Select-Object id,@{label="Filename";expression={$_.FieldValues.FileLeafRef}},@{label="Fileurl";expression={$_.FieldValues.FileRef}}



ForEach($customerFolder in $customerFolders)
{
  $customerFolder
}

This is the result of the script:-

Id Filename                          Fileurl
-- --------                          -------
 4 ClientA                           /sites/Clients/Customer Share/Clientss/ClientA
 5 ClientB                           /sites/Clients/Customer Share/Clientss/ClientB
 6 ClientC                           /sites/Clients/Customer Share/Clientss/ClientC
13 underB                            /sites/Clients/Customer Share/Clientss/ClientB/underB
15 underb2                           /sites/Clients/Customer Share/Clientss/ClientB/underB/underb2
19 em                                /sites/Clients/Customer Share/Clientss/ClientC/em
 7 Questions-Database Programmer V1.docx /sites/Clients/Customer Share/Clientss/ClientA/Questio…
 8 Sharepoint-metabata-sitesV3.docx  /sites/Clients/Customer Share/Clientss/ClientA/Sharepoint-meta…
 9 Sharepoint-metabata-sites.docx    /sites/Clients/Customer Share/Clientss/ClientA/Sharepoint-meta…
10 Questions-Database Programmer.docx/sites/Clients/Customer Share/Clientss/ClientA/Questio…
11 1212 - Copy.xlsx                  /sites/Clients/Customer Share/Clientss/ClientB/1212 - Copy.xlsx
12 1212 - Copy - Copy.xlsx           /sites/Clients/Customer Share/Clientss/ClientB/1212 - Copy - C…
14 guru_card_export.csv              /sites/Clients/Customer Share/Clientss/ClientB/underB/guru_car…
16 SharePoint-quote.xlsx             /sites/Clients/Customer Share/Clientss/ClientB/underB/underb2/…
17 Pic-4.png                         /sites/Clients/Customer Share/Clientss/ClientC/Pic-4.png
18 Pic-3.png                         /sites/Clients/Customer Share/Clientss/ClientC/Pic-3.png
20 paras script.txt                   /sites/Clients/Customer Share/Clientss/ClientB/paras script.txt
21 guru_card_export (1).csv          /sites/Clients/Customer Share/Clientss/ClientB/underB/underb2/…
22 contracts.png                     /sites/Clients/Customer Share/Clientss/ClientB/underB/contract…
23 General IO.xlsx                  /sites/Clients/Customer Share/Clientss/ClientB/General…

now after getting the direct folders under the "Clients" main folder, i want to loop through the content of each of the sub-folders separately .. can anyone advice? any advice?