AWS Marketplace AMI Opt-In via CloudFormation - EC2 Image Builder

Short answer to the question is no, you should accept the terms manually from AWS console in this account and your automation(cloudformation in this case) would work throughout the life of AMI.

Second Question:

I mentioned automation would work throughout the life of AMI, but this is subjective and would depend on factors, what are those changes which happened to AMI and does your source AMI filter condition covers those changes or not. In my experience, I have seen both scenarios, where changes to AMI didn't require to opt-in again and there have been case cases, where I had to opt-in again.

Hope you find this useful.

Abhishek