Makefile command for CFTs parameters

I am trying to write a makefile command for the parameters being used in CFT. But its giving error.

This is my parameter in CFT

"ecsPolicies": {
      "Type": "String",
      "Default": "ecr:GetAuthorizationToken,ecr:BatchCheckLayerAvailability,ecr:GetDownloadUrlForLayer,ecr:BatchGetImage,logs:CreateLogStream,logs:PutLogEvents,ecs:RunTask,iam:PassRole"
    },

this is makefile command which I am using

ParameterKey=ecsPolicies,ParameterValue='ecr:GetAuthorizationToken,ecr:BatchCheckLayerAvailability,ecr:GetDownloadUrlForLayer,ecr:BatchGetImage,logs:CreateLogStream,logs:PutLogEvents,ecs:RunTask,iam:PassRole' 

Its throwing error as Invalid type for parameter Parameters[19].ParameterValue, value: ['ecr:GetAuthorizationToken', 'ecr:BatchCheckLayerAvailability', 'ecr:GetDownloadUrlForLayer', 'ecr:BatchGetImage', 'logs:CreateLogStream', 'logs:PutLogEvents', 'ecs:RunTask', 'iam:PassRole'], type: <class 'list'>, valid types: <class 'str'>

Please provide a possible solution!! Thank you