Is it possible to use T2 Unlimited instances in Elastic Beanstalk?

I found a solution. Posting it here in case others run into the same issue:

1. Create an IAM policy that allows the ec2 instances in your elastic beanstalk environment to modify instance credit specification and attach it to your elastic beanstalk ec2 role.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "InstanceCreditPolicy",
            "Effect": "Allow",
            "Action": [
                "ec2:ModifyInstanceCreditSpecification",
                "ec2:DescribeInstanceCreditSpecifications"
            ],
            "Resource": "*"
        }
    ]
}

2. Create an eb extension (.ebextensions/01-set-instance-credit-unlimited.config)

commands:
  set-instance-credit-unlimited:
    command: |
      aws ec2 modify-instance-credit-specification --region <your_region> --instance-credit-specification '[{"InstanceId": "'"$(wget -q -O - http://169.254.169.254/latest/meta-data/instance-id)"'","CpuCredits": "unlimited"}]'