Hello, Gaetano
You may make it work with the next workaround:
1/ Create new mobile panel element
2/ Select more toogle 2 (element type)
3/ Upload custom svg icon or select existed one from the list
4/ Select staticblock type (Content Type Of More Toggle 02 Element option)
5/ Select static block (where you may add your custom shortcode in the editor
6/ The result will be next -> https://prnt.sc/QrIqh6Vo75eI , https://prnt.sc/MsH-ElnXGPkr (on click action will show popup with static block content)
Best Regards,
8Themes Team