Sigma extension in Zoho Native CRM App

Sigma extension in Zoho Native CRM App

Hi, 

I would like to know, if there is any way that we can include a widget or extension that we have developed in Zoho Sigma, in the native Zoho CRM App. 

If this is not possible, there are other ways to develop extensions for this App? Or do we have to recommend our customer do a whole new development to include all the functionality on the CRM plus our new additions?

Thanks.