Create lookup column with multi select option using Powershell

I want to create lookup column with multi select option using PNP PowerShell in SPO.

I am able to create lookup field below script. But i dont know what is the property to be added to make it multi select field. Also, I need to select 2 more columns as additional fields. How to include it.

$SiteURL = "****"
$ListName= "Projects"
$DisplayName = "Parent Project"
$InternalName = "ParentProject"
 
$ParentListName="Parent Projects"
$LookupField = "Title" #Internal Name
 
#Connect to the site
Connect-PnPOnline -Url $SiteURL -Interactive       
 
#Add Lookup Field to the List    
Add-PnPField -List $ListName -Type Lookup -DisplayName $DisplayName -InternalName $InternalName -AddToDefaultView
 
#Set Field Properties
Set-PnPField -List $ListName -Identity $InternalName -Values @{LookupList=(Get-PnPList $ParentListName).Id.ToString(); LookupField=$LookupField}