Will db.t4g be available for reservation on RDS?

Are there any plans to permit the reservation of t4g-class instance types on RDS? Currently, t4g is omitted from the reservation pricing page, at least for MySQL in us-east-1: https://aws.amazon.com/rds/mysql/pricing/?pg=pr&loc=2

Both the AWS web console and direct usage of the API show no offerings for db.t4g:

$ aws --output=json rds describe-reserved-db-instances-offerings --db-instance-class=db.t4g.medium
{
    "ReservedDBInstancesOfferings": []
}