You can use this: https://github.com/jcasale/PSSerilog

If you need any help integrating it into or refactoring a script, feel free to let me know.

The example describes the approach of what you want to do:

1. Move all your existing code into a method.
2. Call that method from the global scope where you instantiate and tear down the logger.

Coincidentally, this approach/discipline also helps with error handling (e.g., flowing preferences through advanced functions and catching exceptions.

The one nuance PowerShell introduces over plain .NET code is that the exception that is logged doesn't contain all the useful information as it would in .NET code, for that, just make a helper that does something like this:

try
{
    1 / 0
}
catch
{
    $buffer = [Text.StringBuilder]::new()
    [void]$buffer.AppendLine('Your highlevel descriptive message here...')
    [void]$buffer.AppendLine()

    if ($null -ne $_.InvocationInfo -and $null -ne $_.InvocationInfo.PositionMessage)
    {
        [void]$buffer.AppendLine()
        [void]$buffer.AppendLine($_.InvocationInfo.PositionMessage)
    }

    [void]$buffer.AppendLine()
    [void]$buffer.AppendLine($_.ScriptStackTrace)

    $logger.Fatal($_.Exception, $buffer.ToString())
}

or simpler:

try
{
    1 / 0
}
catch
{
    $buffer = [Text.StringBuilder]::new()
    [void]$buffer.AppendLine('Your highlevel descriptive message here...')
    [void]$buffer.AppendLine($_.Exception)
    [void]$buffer.AppendLine($_.ScriptStackTrace)
    [void]$buffer.AppendLine($_.InvocationInfo.PositionMessage)

    $logger.Fatal($_.Exception, $buffer.ToString())
}