OpenVAS & GSA Cross Cloud Account/Subscription Scanning

Having installed OpenVAS onto an AWS EC2 (CentOS7) instance and utilising the AtomicCorp Docker image my question is with later versions can cross account roles be utilised for scanning purposes? For example I have my account Test A (containing OpenVAS) and I want to scan instances within Test B also owned by me, is this possible with a cross account IAM role with relevant permissions?

Based on the AtomicCorp Docker image (GSA 7.0.2) it doesn’t appear possible, it appears as though you can provide Username/Password, Username/SSH Keys, Client Certificate, etc. Having reviewed documentation I’ve been unable to locate any information fully supporting Cloud scanning.