CloudFormation Transform::Include parameters - amazon-ec2

Question

I want to use AWS macro Transform::Include with some dynamic parameters for my file.
Resources:
'Fn::Transform':
Name: 'AWS::Include'
Parameters:
TestMacroVariable:
Default: 2
Type: Number
Location: !Sub "s3://${InstallBucketName}/test.yaml"
test.yaml:
DataAutoScalingGroup:
Type: AWS::AutoScaling::AutoScalingGroup
Properties:
LaunchConfigurationName:
Ref: DataLaunchConfiguration
MinSize: '1'
MaxSize: '100'
DesiredCapacity:
Ref: TestMacroVariable
...
After calling: aws cloudformation describe-stack-events --stack-name $stack
I get:
"ResourceStatusReason": "The value of parameter TestMacroVariable
under transform Include must resolve to a string, number, boolean or a
list of any of these.. Rollback requested by user."
When I try to do it this way:
Resources:
'Fn::Transform':
Name: 'AWS::Include'
Parameters:
TestMacroVariable: 2
Location: !Sub "s3://${InstallBucketName}/test.yaml"
I get:
"ResourceStatusReason": "Template format error: Unresolved resource
dependencies [TestMacroVariable] in the Resources block of the
template"
Error is the same when I don't provide TestMacroVariable at all.
Tried with different types: String, Number, Boolean, List - none of them work.

Answer 1

As i know you cannot have anything other than Location key in the Parameters section of the AWS::Include. Check here AWS DOC

Answer 2

As an alternative, you can pass in the whole S3 path as a parameter and reference it in Location:
Parameters:
MyS3Path:
Type: String
Default: 's3://my-cf-templates/my-include.yaml'
...
'Fn::Transform':
Name: 'AWS::Include'
Parameters:
Location: !Ref MyS3Path

Answer 3

Building on what #BatteryAcid Said you can refer the parameters in your Cloudformation template directly from your file using Sub function:
In your CF template :
Parameters:
TableName:
Type: String
Description: Table Name of the Dynamo DB Users table
Default: 'Users'
In the file you are including:
"Resource": [
{
"Fn::Sub": [
"arn:${AWS::Partition}:dynamodb:${AWS::Region}:${AWS::AccountId}:table/${tableName}",
{
"tableName": {
"Ref": "TableName"
}
}
]
}
Alternatively doesn't have to be a parameter but any resource from your template :
Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${QueryTelemtryFunction.Arn}/invocations