PSFunctions/Export-DataverseOptionSet.ps1

function Export-DataverseOptionSet {
    [CmdletBinding(SupportsShouldProcess = $True)]
    param (
        [Parameter(Mandatory = $true, ValueFromPipeline = $true, HelpMessage = "Enter one or more OptionSet names separated by commas.")]
        [string[]]
        $OptionSet
    )
    #TODO: Support switch argument (-NameValueOnly)
    #TODO: Support switch argument (-LanguageCode) with default value 1033
    process {
        foreach ($name in $OptionSet) {
            if(!$PSCmdlet.ShouldProcess($name)) { continue }
            
            Send-DataverseOperation "GlobalOptionSetDefinitions(Name='$OptionSet')" `
                | Select-Object -ExpandProperty Content `
                | ConvertFrom-Json `
                | Select-Object -ExpandProperty Options
                | Select-Object -ExpandProperty Label -Property Value
                | Select-Object -ExpandProperty LocalizedLabels -Property Value
                | Where-Object { $_.LanguageCode -eq 1033 }
                | Select-Object Value, Label
        }
    }
}