How to provide the Root Manager Connection String In Service Bus

Hi, 

    I have below scenario.

I created a service bus in azure portal and i have a RootManager Connection String with below access.

Now i connected the RootManager connection string in Service Bus Explorer(Version:4.1.112). i have an access to create and delete the topics.  Here i want to restricts my end user to create the topics and delete existing topics and subscriptions. That mean i want to provide only readonly access like a sql server. 

1. Is any possibility there to provide the readonly access to the RootManager Connection string. If yes please share the details.

2. If we set the readonly access then can we restrict to delete the existing topics and subscriptions.

Kindly provide your answer to mitigate the issue.