AWS: Onboarding on premise instance Is there a way to onboard the Raspberrypi device in AWS. So that the same device can be managed using ec2 console and it can seamlessly work with the rest of AWS services?

I am just an experimental user, I don't need much heavy computer but use AWS to host my website and blogs, etc.
AWS console is for managing AWS resources, which, arguably, your Raspberry Pi is not. 

Some services can work with non-AWS resources. For example you can install System manager agent (though not sure if there is a RPi version) on on-prem servers. 

Alternatively you can install AWS Greengrass for Raspberry Pi that gives it some AWS capabilities. 

Hope that helps :)