Hi - Not sure what the use case is but you can try the following combination to get what you need.
- describe-db-instances - this will provide "DBInstanceClass"
- describe-instance-types - this will provide details on "DefaultVCpus", "MemoryInfo" which will be "SizeInMiB". You may have to remove "db." before making call e.g. aws ec2 describe-instance-types --instance-types r6i.12xlarge
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