get-totals-from-listview.ps1

#This script gets the totals from a list view
Connect-PnPOnline https://siteurl
$context = Get-PnPContext
$list = $context.Web.Lists.GetByTitle("mylist")
$view =$list.Views.GetByTitle("MyViewWithTotals")
$context.Load($view)
$context.ExecuteQuery()
# we only need one item, not more
$viewxml = $view.ListViewXml -replace '<RowLimit Paged="TRUE">\d*</RowLimit>','<RowLimit>1</RowLimit>'
$result = $list.RenderListData($viewxml)
$context.ExecuteQuery()
$obj = ConvertFrom-Json $result.Value
$row = $obj.Row[0]
# Now use your values
$count = $row.'LinkTitle.COUNT'
$sizeSum = $row.'size.SUM'