Automatic documentation conversion from Doxygen

Thank you for your answers. I suppose the method ROOT: TObject Class Reference may suggest that ROOT can “understand” some comments as @Axel said.

.help metacommand is indeed powerful as mentionned in
.help metacommand extension and use with Python/Jupyter.

Then what about retrieving (local) Doxygen information into console?
Warning: Viewer discretion advised:

$ root
   ------------------------------------------------------------------
  | Welcome to ROOT 6.22/02                        https://root.cern |
  | (c) 1995-2020, The ROOT Team; conception: R. Brun, F. Rademakers |
  | Built for linuxx8664gcc on Aug 17 2020, 12:46:52                 |
  | From tags/v6-22-02@v6-22-02                                      |
  | Try '.help', '.demo', '.license', '.credits', '.quit'/'.q'       |
   ------------------------------------------------------------------

root [0] gSystem->Exec("links file:///data/[...]/URANIE/20401/[...]/root/doxygen/master/classTCanvas.html#a2aa8e879505f21da08af0853abe640c2")
   Int_t TCanvas::GetWindowTopX (  )                                                                                                                                                     
                                                                                                                                                                                         
   Returns current top x position of window on screen.                                                                                                                                   
                                                                                                                                                                                         
   Definition at line 1186 of file TCanvas.cxx.

Then q to quit:

                                                                                                                                                                                         
   Reimplemented from TPad.                                          +---------------- Quitter ? -----------------+                                                                      
                                                                     |                                            |                                                                      
   Definition at line 165 of file TCanvas.h.                         |  Êtes-vous sûr de vouloir quitter Links ?  |                                                                      
                                                                     |                                            |                                                                      
   Size_t TCanvas::GetXsizeReal (  ) const inline                    |              [ Oui ]  [ Non ]              |                                                                      
                                                                     +--------------------------------------------+                                                                      
   Definition at line 157 of file TCanvas.h.                                                                          
(int) 0
root [1] .q