I have a spring boot server deployed in ec2 which uses Parameter store in System manager to keep the application secrets.
I want to deploy the same now on AWS Lightsail instance.
Please help if this is possible. if yes, how to do it.
Yes, you can do this, but not through instance roles (lightsale instances do not support roles). Instead you have to setup AWS credentials on the Lightsail instance as you would do on your local linux workstation.