Add Client Side WebPart using PnP PoSh

addClientSideWebPart.ps1

function ConvertTo-Hashtable {
    [CmdletBinding()]
    [OutputType('hashtable')]
    param (
        [Parameter(ValueFromPipeline)]
        $InputObject
    )
 
    process {
        if ($null -eq $InputObject) {
            return $null
        }
        if ($InputObject -is [System.Collections.IEnumerable] -and $InputObject -isnot [string]) {
            $collection = @(
                foreach ($object in $InputObject) {
                    ConvertTo-Hashtable -InputObject $object
                }
            )

            Write-Output -NoEnumerate $collection
        } elseif ($InputObject -is [psobject]) {
            $hash = @{}
            foreach ($property in $InputObject.PSObject.Properties) {
                $hash[$property.Name] = ConvertTo-Hashtable -InputObject $property.Value
            }
            $hash
        } else {
            $InputObject
        }
    }
}

Connect-PnPOnline -Url https://m365x642699.sharepoint.com/sites/NewYork03

$jsonObj = '{"title":"Site Contact","layout":2,"persons":[{"id":"i:0#.f|membership|alexw@m365x642699.onmicrosoft.com"}]}'
$wp = $jsonObj | ConvertFrom-Json | ConvertTo-HashTable

#Add People webpart with default user, to column 2 in section 1
Add-PnPClientSideWebPart -Page "Home" -DefaultWebPartType People -Section 1 -Column 2 -WebPartProperties $wp

#Finally publish the page
Set-PnPClientSidePage -Identity "Home" -Publish