I think it's going to be too complicated.
Affinity converts all the text into curves, and Canva generates lots of tiny images that combine the text, headings, and illustrations, so editing them individually would take forever.
I think the easiest solution would be for me to write the text in French and send it to you instead.
By the way, I couldn't find any way to contact you from your itch.io page. Do you happen to have a Discord, Bluesky, or another social media account? 😊