Pipe serial number to Powershell parameter (Dell Warranty Info) and add results to inventory field

I have a working Powershell script that takes a serial number as an input and then returns Dell warranty info.I would like to do two things:

1. Create a tool that pipes the serial number to the script.

   Perhaps: "$env:Computer.SerialNumber = $ServiceTags"  will work?

2. Takes the returned warranty information and adds it to a custom warranty date field 

Here is the working script:

function Get-DellWarrantyInfo {
# Input Service Tag
Param(
[Parameter(Mandatory = $true)]
$ServiceTags
)

## API key
$ApiKey = "xxxxxxxxxxxx"
$KeySecret = "xxxxxxxxxx"

[String]$servicetags = $ServiceTags -join ", "

$AuthURI = "https://apigtwb2c.us.dell.com/auth/oauth/v2/token"
$OAuth = "$ApiKey`:$KeySecret"
$Bytes = [System.Text.Encoding]::ASCII.GetBytes($OAuth)
$EncodedOAuth = [Convert]::ToBase64String($Bytes)
$Headers = @{ }
$Headers.Add("authorization", "Basic $EncodedOAuth")
$Authbody = 'grant_type=client_credentials'
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
Try {
$AuthResult = Invoke-RESTMethod -Method Post -Uri $AuthURI -Body $AuthBody -Headers $Headers
$Global:token = $AuthResult.access_token
}
Catch {
$ErrorMessage = $Error[0]
Write-Error $ErrorMessage
BREAK
}
Write-Host "Access Token is: $token`n"

$headers = @{"Accept" = "application/json" }
$headers.Add("Authorization", "Bearer $token")

$params = @{ }
$params = @{servicetags = $servicetags; Method = "GET" }

$Global:response = Invoke-RestMethod -Uri "https://apigtwb2c.us.dell.com/PROD/sbil/eapi/v5/asset-entitlements" -Headers $headers -Body $params -Method Get -ContentType "application/json"

foreach ($Record in $response) {
$servicetag = $Record.servicetag
$Json = $Record | ConvertTo-Json
$Record = $Json | ConvertFrom-Json
$Device = $Record.productLineDescription
$EndDate = ($Record.entitlements | Select -Last 1).endDate
$Support = ($Record.entitlements | Select -Last 1).serviceLevelDescription
$EndDate = $EndDate | Get-Date -f "MM-dd-y"
$today = get-date

Write-Host -ForegroundColor White -BackgroundColor "DarkRed" $Computer
Write-Host "Service Tag : $servicetag"
Write-Host "Model : $Device"
if ($today -ge $EndDate) { Write-Host -NoNewLine "Warranty Exp. : $EndDate "; Write-Host -ForegroundColor "Yellow" "[WARRANTY EXPIRED]" }
else { Write-Host "Warranty Exp. : $EndDate" }
if (!($ClearEMS)) {
$i = 0
foreach ($Item in ($($WarrantyInfo.entitlements.serviceLevelDescription | select -Unique | Sort-Object -Descending))) {
$i++
Write-Host -NoNewLine "Service Level : $Item`n"
}

}
else {
$i = 0
foreach ($Item in ($($WarrantyInfo.entitlements.serviceLevelDescription | select -Unique | Sort-Object -Descending))) {
$i++
Write-Host "Service Level : $Item`n"
}
}
}

}