How to create relationships between tables?

How can I create relationships between tables in a dataset that I create like this?

foreach($file in $files)
{ 
    ...
    foreach($col in $cols)
    {
        $columns += New-PowerBIColumn -Name $col -DataType String
    }
    $tables += New-PowerBITable -Name $file.BaseName -Columns $columns
}
$ds = New-PowerBIDataset -Name $name -Tables $tables
Add-PowerBIDataset -Dataset $ds

No repository files or tests are identified in the issue. Start by reviewing the Power BI dataset and table commands shown, especially New-PowerBITable, New-PowerBIDataset, and Add-PowerBIDataset, then check whether the module documents relationship creation. Done means providing a verified relationship workflow or documenting that the capability is unavailable.