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This is answered by heath if you get lucky with your search:

Using data from a file as a string value in serverless.yml

Is it possible to import the contents of an external file as a value in serverless.yml. My usecase is for creating an AWS CloudWatch Dashboard, the DashboardBody element takes a string of JSON configuration. I could just write this into the yaml file, but it would be way nicer if I could do the following: resources: DashboardIntegrationMonitor: Type: AWS::CloudWatch::Dashboard Properties: DashboardName: "${self:provider.stage}Importer" DashboardBody: "${file(./dashboard.js…