Interpretation point in a hashtable

Question

There is a hashtable:

$Main = @{
    One = 'One Value'
    Two = @{    
        Two = 'Two Value'
        Tree = @{        
            Tree = 'Tree Value'
        }    
    }
}

Why can't I get the values this way?

# It works
$Want = 'One'
$Main.$Want

# This does not work. I get a void
$Want = 'Two.Two'
$Main.$Want

# And that of course doesn't work either
$Want = 'Two.Tree.Tree'
$Main.$Want

How to modify $Want string so that it turns out to be possible (for example, [Something]$Want = 'Two.Tree.Tree' and I get the value $Main.$Want of Tree Value).

At the moment, I have made such a decision. But for sure there are shorter and faster solutions provided.

$Main = @{
    One = 'One Value'
    Two = @{    
        Two = 'Two Value'
        Tree = @{        
            Tree = 'Tree Value'
        }    
    }
}

# $Want = 'One'
# $Want = 'Two.Two'
$Want = 'Two.Tree.Tree'

$Want = $Want -Split '\.'
$Want = Switch ( $Want.Length ) {

    1 { $Main.($Want[0]) }
    2 { $Main.($Want[0]).($Want[1]) }
    3 { $Main.($Want[0]).($Want[1]).($Want[2]) }
}

$Want

# Result 'Tree Value'

Answer 1

Use Invoke-Expression:

$Want = 'Two.Two'

Invoke-Expression ('$Main.' + $Want)