Hi @Olivier_MOUGEL, welcome and thank you for your question! I have changed your post’s title to bring it in line with the question guidelines and thus make it easier to understand from the title:
Good titles are questions you would ask your friend about Typst.
I hope I didn’t change the meaning you had in mind, looking back a few minutes later I’m not 100% sure… you can change it again if needed.
I have also formatted your code, please check the linked post and/or your post’s edit history on how to do that next time, and post a complete snippet as @flokl said.
Thanks!