Thanks for reaching out!
This UserVoice / feedback forum is the communication channel for new features and idea's related to Azure.
I believe currently there is no straight-forward default supported way for your ask to suffix with incremental numbers for a resource automatically. This is a good idea which can be shared in above provided UserVoice / feedback forum so that our product group / responsible feature team would check feasibility of the feature request, prioritize against existing feature backlog and add in roadmap as appropriate. Once feedback is created, you may upvote it and other features that are of interest. We would announce and/or update the related Azure document once a feature request is addressed.
With the current available features, to try accomplishing your requirement (i.e., to enforce rules around naming convention of Azure resources), you may leverage Azure Policy and/or ARM templates i.e., leverage available built-in policies or create custom policies as per your needs and/or leverage functions like copyindex and come up with ARM templates to validate and create set of required resources in a resource group, etc.