This is a PowerShell module that allows you to convert between PowerShell and YAML objects. You can do this

import-module psyaml
    $yamlString =@"
    invoice: !!str 34843
    date   : 2001-01-23
    approved: yes
    bill-to: 
        given  : Chris
        family : Dumars
        address:
            lines: |
                458 Walkman Dr.
                Suite #292
            city    : Royal Oak
            state   : MI
            postal  : 48046
    ship-to: id001
    product:
        - sku         : BL394D
          quantity    : 4
          description : Basketball
          price       : 450.00
        - sku         : BL4438H
          quantity    : 1
          description : Super Hoop
          price       : 2392.00
    tax  : 251.42
    total: 4443.52
    comments: >
        Late afternoon is best.
        Backup contact is Nancy
        Billsmer @ 338-4338.

"@
$YamlObject=ConvertFrom-YAML $yamlString
ConvertTo-YAML $YamlObject

For all the background and details see the documentation