As mentioned before, there is no documentation yet about how to develop your own widgets for Centreon Dashboards.
@guillaume.boucher The way the new widgets are implemented is to ease the development about the widget configuration but you still have to know React in order to create your own widget. But there is no documentation currently because our Developer Experience (DX) is not satisfying yet (no development ecosystem, missing input types...)
Thank you tom for this answer, I understand perfectly and without being a specialist in React or any other Web.UI presentation framework (because I am not a professional developer). I thought I could manage if a minimalist code was proposed, I will wait a bit and with luck my needs will be directly available in the next version