require to add a specific program to a group chat

When I create a group meeting/chat, I want to add a specific teams application that we are creating. Can I specificy the configuration of the tabs so the attenders have to install it before or while the meeting starts?

Another question about this: our teams application will be released to the store, and will interact with the web apis of out customers, but could happens that if the customer A start a meeting, when the program is added I have to connect to the web api of customer A, but if customer B starts a meeting, the attenders of meeting B must use the same application to connect to webapi of customer B. 

How can I configure this?