Add a custom message into Access Requests Setting' filed

[Naligurtan]

Hello,

I have over 200 SharePoint sites.

I want to add a custom message into the box/area just under the "Include a custom message to users who see access request page" for all this sites at once using the PowerShell. 

I was wondering if anyone knows how to script this case.

Thanks

[#2]

Hello,
I don't that is currently possible with PowerShell (Official module and PnP)
You could try to play around with the REST API Call but that seems overly complicated