Running R data science functions serverless is key for those organisations which have a deep investment in skills and code in this language. Azure ML Workbench has no R support so the only way to run R in Azure is with Spark Data Bricks or use a VM with R server installed.
Thanks for your feedback. Currently, we don’t have any plans for R support in Functions. We will monitor the votes on this request to accordingly inform the priority on our backlog.