Auto generating new post/page in the SharePoint site from the item of SharePoint List

HelloBenTeoh 

Thanks for your recommendation! 

I have followed the steps and adjusted my column type like this

But I always get error BadGateway on SavePageAsDraft step.
error message: "There was an error deserializing the object of type Microsoft.SharePoint.Publishing.SitePageFieldsData. Encountered unexpected character 'E'.\r\nclientRequestId: \r\nserviceRequestId: "

This is the json body

{
"__metadata": {
"type": "SP.Publishing.SitePage"
},
"LayoutWebpartsContent": "[{\"id\":\"cbe7b0a9-3504-44dd-a3a3-0e5cacd07788\",\"instanceId\":\"cbe7b0a9-3504-44dd-a3a3-0e5cacd07788\",\"title\":\"Title area\",\"description\":\"Title area description\",\"audiences\":[],\"serverProcessedContent\":{\"htmlStrings\":{},\"searchablePlainTexts\":{},\"imageSources\":{\"imageSource\":\"/_layouts/15/images/sleektemplateimagetile.jpg\"},\"links\":{},\"customMetadata\":{\"imageSource\":{}}},\"dataVersion\":\"1.4\",\"properties\":{\"imageSourceType\":2,\"title\":\"Test Article Template\",\"textAlignment\":\"Left\",\"showPublishDate\":true,\"authors\":[{\"id\":\"\",\"upn\":\"\",\"email\":\"\",\"name\":\"\",\"role\":\"-\"}],\"showTopicHeader\":false,\"authorByline\":[\"\"],\"layoutType\":\"NoImage\",\"topicHeader\":\"\",\"enableGradientEffect\":true,\"isDecorative\":true},\"containsDynamicDataSource\":false,\"reservedHeight\":159}]",
"CanvasContent1": "[{\"controlType\":4,\"id\":\"1212fc8d-dd6b-408a-8d5d-9f1cc787efbb\",\"position\":{\"controlIndex\":2,\"sectionIndex\":1,\"sectionFactor\":12,\"zoneIndex\":1,\"layoutIndex\":1},\"addedFromPersistedData\":true,\"innerHTML\":\"<p>@{triggerOutputs()?['body/Description']}</p>\"},{\"controlType\":0,\"pageSettingsSlice\":{\"isDefaultDescription\":true,\"isDefaultThumbnail\":true,\"isSpellCheckEnabled\":true,\"globalRichTextStylingVersion\":0,\"rtePageSettings\":{\"contentVersion\":5},\"isEmailReady\":false}}]",
"AuthorByline": [],
"TopicHeader": "",
"BannerImageUrl": "/_layouts/15/images/sitepagethumbnail.png",
"Title": "@{triggerOutputs()?['body/Title']}"
}

Could you help me for this? 

Regards,

Arine