how to add variable to event reactive input id in shiny ?

[jumbo]

observeEvent(input$insertBtn,{
   
 bins<<-as.character(paste0("input$bins",inx))
   print(paste("Logger a",aa))
   return(aa)
   
 })

 a2<-eventReactive(input[[bins]],{
   print(paste("logger bin",bins))
 )}