Add client-side web part to modern page

• command: spo page clientsidewebpart add -n|--pageName <pageName> -u|--webUrl <webUrl> --standardWebPart [standardWebPart] --webPartId [webPartId] --webPartProperties [webPartProperties] --section [section] --column [column] --order [order]
• pageName: name of the page to add the web part to
• webURL: URL of the site where the page to edit is located
• standardWebPart: set to add one of the standard SharePoint web parts. Available values: ThirdParty|ContentRollup|BingMap|ContentEmbed|DocumentEmbed|Image|ImageGallery|LinkPreview|NewsFeed|NewsReel|PowerBIReportEmbed|QuickChart|SiteActivity|VideoEmbed|YammerEmbed|Events|GroupCalendar|Hero|List|PageTitle|People|QuickLinks|CustomMessageRegion|Divider|MicrosoftForms|Spacer
• webPartId: set to add a custom web part
• webPartProperties: JSON string with web part properties to set on the web part
• section: number of section to which the text should be added (1 or higher)
• column: number of column in which the text should be added (1 or higher)
• order: order of the section
• specify standardWebPart or webPartId but not both

For more information see the Add-PnPClientSideWebPart cmdlet.