Using a custom svg to select mapstore plugins

[LPoin]

I want to use a custom SVG for Cadastrapp plugin.
(cadastrapp issue-175)
It's ok in the plugin itself but the icon in selection plugin mapstore page is not changed.

It seems to be set in assets/index.json in glyph.

{
  "plugins": [
    {
      "name": "Cadastrapp",
      "glyph": "th",
      "docUrl":"https://github.com/georchestra/mapstore2-cadastrapp#plugin-configuration",
      "defaultConfig": {
        "openOnLoad": false,
        "helpUrl": "https://docs.georchestra.org/cadastrapp/latest/guide_utilisateur/",
        "foncier": true,
        "popup": {
          "minZoom": 14,
          "timeToShow": 1000
        }
      },
      "dependencies": [
        "SidebarMenu"
      ]
    }
  ]
}

But it's impossible to use svg in json.
Is their any solution to resolve that ?
Thanks