Add-PnPPageWebPart | Example WebPartProperties

[HeKr09]

Can anyone show me an example for the WebPartProperties of the command Add-PnPPageWebPart.
Unfortunately the following code

Add-PnPPageWebPart -Page $page -DefaultWebPartType Image -Section 2 -Column 2 -WebPartProperties "{'imageSourceType':2,'altText':'Image','overlayText':'Image','fileName':'$($placeholderImg.Name)','siteId':'$($site.Id)','webId':'$($web.Id)','listId':'$listId','uniqueId':'030845d6-0e76-4418-bc6b-82d2457dcfa5','imgWidth':2064,'imgHeight':1376,'isFullWidth':true,'resizeCoefficient':1,'alignment':'Center','fixAspectRatio':false,'isOverlayTextEnabled':false,'captionText':''}"

throws an exception but worked in the old version.

Add-PnPPageWebPart : Cannot bind parameter 'WebPartProperties'. Cannot convert value "{'autoHide':true,'height':84}"
to type "PnP.PowerShell.Commands.Base.PipeBinds.PropertyBagPipeBind". Error: "''' is an invalid start of a property
name. Expected a '"'. LineNumber: 0 | BytePositionInLine: 1."
At D:\TFS\Create-ContentTemplate.ps1:222 char:118
+ ... WebPartType Spacer -WebPartProperties "{'autoHide':true,'height':84}"
+                                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Add-PnPPageWebPart], ParameterBindingException
    + FullyQualifiedErrorId : CannotConvertArgumentNoMessage,PnP.PowerShell.Commands.WebParts.AddWebPart

[HeKr09]

Also this one here doesn't work too and I guess there is no missing character?

Add-PnPPageWebPart -Page $page -Section 6 -Column 1 -Order 1 -DefaultWebPartType Spacer -WebPartProperties "{'autoHide':true,'height':84}"