Launch multiple EC2 instances for ECS without using Autoscaling

I have an appsec.yml file for creating ECS Cluster utilising Autoscaling for Instance Launching.

I have a requirement of not using autoscaling and getting the no: of instances as user input and launching that many instances.

I have CFT inside my appsec.yml template but I understand CFT doesn't support looping.

I used troposphere though I have not much knowledge in Python but face many errors.

Can anyone provide any lead or show me some example code?