How to add progress bar (data loading icon) to leaflet map in rmarkdown document with shiny

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Hi, I have web application build on rmarkdown,leaflet, shiny, flexdashboard:

https://shiny.fzp.czu.cz/KVHEM/OPAT/

After you select area from select box, leaflet map is rendered.
But it loads lot of geometry and takes a time (20-30 seconds), so I need to add there some information for user
like progress bar or data loading icon. I found on internet some solutions for leaflet standalone,
but nothing for leaflet implemented as a part of rmardown document together with shiny and flex dashboard.

Here is the rmarkdown document head:

---
title: "TYPOVÁ OPATŘENÍ PRO OMEZENÍ SUCHA"
output: 
  flexdashboard::flex_dashboard:
    orientation: columns
    vertical_layout: fill
    css: 'styles.css'
runtime: shiny
---

Thanks for any advice !

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