Hi Alvise,
In that case, you can try to customize [tribe_events_list] yourself and add in the excerpt.
That shortcode’s attributes come from /wp-content/plugins/events-calendar-pro/src/Tribe/Shortcodes/Events_List.php
And then it runs PRO’s Event List Widget output, which is from /wp-content/plugins/events-calendar-pro/src/Tribe/Advanced_List_Widget.php
As far as the template that gets used, that’s at /wp-content/plugins/events-calendar-pro/src/views/pro/widgets/list-widget.php, which is able to be overridden via our Themer’s Guide.
If this functionality is a requirement for your intended project, I’d suggest that a third-party developer would be the best way to make this feature happen on a short timeline. ? We maintain a list of developers who work with our plugins on our Knowledgebase here:
https://theeventscalendar.com/knowledgebase/find-a-customizer/
Let me know how that goes and if you have any other questions along the way!
Thanks,
Jaime