Automate Gateway Join to Cluster

We have a self-hosted gateway on Azure VM as per this model: https://azure.microsoft.com/en-us/blog/securing-the-connection-between-power-bi-and-azure-sql-database/

We want to add another node to the cluster.  This can apparently be done easily using the installation UI by checking this box:

We have automated our gateway install using the Powershell scripts.  There are many blogs describing this, one is: https://rukiatu.com/automate-power-bi-gateway-installation-and-configuration/

However there doesn't seem to be a way to "tick that checkbox" via the powershell scripts.

Question is:  is there a way to automate adding a second gateway node into a cluster?