EnableRatingsOnList.ps1

function Enable-CustomLikesRatingsOnLibrary {
[CmdletBinding()]
    Param(
        [Parameter(Mandatory=$true)]
        [Microsoft.SharePoint.Client.Web]$Web,
        [Parameter(Mandatory=$true)]
        [String]$ListRelativeUrl
    )

    # Get required fields
    $AverageRatingField = $Web.Fields.GetById([guid]"5a14d1ab-1513-48c7-97b3-657a5ba6c742") # AverageRating
    $RatingCountField = $Web.Fields.GetById([guid]"b1996002-9167-45e5-a4df-b2c41c6723c7") # RatingCount
    $RatedByField = $Web.Fields.GetById([guid]"4D64B067-08C3-43DC-A87B-8B8E01673313") # RatedBy
    $RatingsField = $Web.Fields.GetById([guid]"434F51FB-FFD2-4A0E-A03B-CA3131AC67BA") # Ratings
    $LikesCountField = $Web.Fields.GetById([guid]"6E4D832B-F610-41a8-B3E0-239608EFDA41") # LikesCount
    $LikedByField = $Web.Fields.GetById([guid]"2CDCD5EB-846D-4f4d-9AAF-73E8E73C7312") # LikedBy

    $Context.Load($AverageRatingField)
    $Context.Load($RatingCountField)
    $Context.Load($RatedByField)
    $Context.Load($RatingsField)
    $Context.Load($LikesCountField)
    $Context.Load($LikedByField)
    Execute-SPOQuery

    # Get the library for the site
    $ServerRelativeUrl = $Web.ServerRelativeUrl
    if ($ServerRelativeUrl -ne "/")
    {
        $ServerRelativeUrl = $ServerRelativeUrl + "/"
    }

    $List = $Web.GetList($ServerRelativeUrl + $ListRelativeUrl)
    $ListRootFolder = $List.RootFolder
    $ListRootFolderProperties = $ListRootFolder.Properties
    $Context.Load($List)
    $Context.Load($ListRootFolder)
    $Context.Load($ListRootFolderProperties)
    Execute-SPOQuery

    # Add fields
    $List.Fields.Add($AverageRatingField)
    $List.Fields.Add($RatingCountField)
    $List.Fields.Add($RatedByField)
    $List.Fields.Add($RatingsField)
    $List.Fields.Add($LikesCountField)
    $List.Fields.Add($LikedByField)
    $List.Update()
    Execute-SPOQuery

    # Update default view
    $ListDefaltView = $List.DefaultView
    $Context.Load($ListDefaltView)
    Execute-SPOQuery

    $ListDefaltView.ViewFields.Add("LikesCount")
    $ListDefaltView.Update()
    Execute-SPOQuery

    # Update property bag
    $ListRootFolderProperties["Ratings_VotingExperience"] = "Likes"
    $ListRootFolder.Update()
    Execute-SPOQuery
}