Hey @Luc Plas
If that's the case then the process you're using on your Project is definitely wrong and you have to examine that first. As you need to structure your projects in a way that only members working on it has access and not everyone that's on the instance.
apart from approach to request via API that already was mentioned by @Prince Nyeche sometimes there is a demand for a solution which does not require interactive with API.
In the past the App "Project Role Tab" was mentioned here in Community but I have not tested it myself - so you would need to evaluate if the approach of using some code and accessing the API or inducting a new App would the better way.
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