Log Analytics KQL for CPU Percentage of App Service Plan

This seems like it should be easy, but I can't seem to find the data in my Log Analytics Workspace (LAW) to be able to write a KQL query to get CPU Percentage for an App Service Plan. I realize there is already a chart in the portal with this information,

but I want to do this using KQL because I am combining several pieces of data together to put on an Azure dashboard.

Googling gives me something like this:

''''

AzureMetrics 
| where  ResourceProvider == "MICROSOFT.WEB" and MetricName == "CPUPercentage"

''''

But that gives me no results for any time period. So either this query is not correct or maybe the data I am looking for is not in LAW? Maybe I have to configure some connection between the App Service Plan and LAW?