Label handling

I refer to *bloggercode-blogconnexion* article 
https://bloggercode-blogconnexion.blogspot.de/2016/08/sub-category-in-labels-widget.html

Is there a way to generate the read and handle the red marked values 
dynamically?

<b:includable id='list'>
    <b:with value='*["Mes vidéos","Mes photos","Mes recettes"]*' 
var='mainList'>
        <ul> ...

Instead of every time changing this code when a new category was created I 
would like to read out an external (JSON) list

<b:includable id='list'>
    <b:with value='
*DEFINED_IN_EXTERNAL_LIST___PERHAPS_A_JAVASCRIPT_VARIABLE*' var='mainList'>
        <ul> ...



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