Can I change default comment character for shell script? (Ctrl + /)

I'm currently working with GTKDialog and using the '##' as a pattern to identify comments inside code.

export MAIN="$(sed -e "s/##.*//" <<< "${XML}")"

XML is a variable where the code is stored.

The problem here is that Intellij Idea use a single '#' for comments in shell script when Ctrl + / shortcut is pressed.
Is there a way to change the default comment character when using Ctrl + /?

Here's a example:

#!/bin/bash

XML='

<window title="Jetbrains" icon-name="gtk-about" resizable="true" width-request="250" height-request="150">

## Comment
# Not a Comment because it would supress RGB color codes -> #0D48D2

<vbox>

  <hbox space-fill="true">
    <text>
    <label>-</label>
    </text>
  </hbox>

</vbox>

</window>
'

export MAIN="$(sed -e "s/##.*//" <<< "${XML}")"
gtkdialog --program=MAIN --center