o365 group default settings "Let people outside of the organisation email the group"

Yes I've used the powershell cmdlet Set-UnifiedGroup -RequireSenderAuthenticationEnabled $false
to apply this to all current sites.
But I've setup site designs studio to automate the deployment of sites. I can create a script to load with the new site creation but I havent found reference to a json schema that does the same and excuse my profound ignorance but I presume I can't just use the cmdlet -RequireSenderAuthenticationEnabled $false in the json like below
{
"verb": "RequireSenderAuthenticationEnabled",
"capability": "False"
}