Welcome to the Microsoft Q&A Platform.
Thank you for reaching out and I hope you are doing well.
I checked with our team and at this time for a single AKS cluster the 100 node pool limit is a hard limit.
With that being said we are always working to improve our platform. Please feel free to add your feedback to the below forum for consideration in future releases.
You can also see what is being planned ahead in our public roadmap on GitHub.
We also have a general Azure updates page for newly released features.
Please "Accept the answer" if the information helped you. This will help us and others in the community as well. Feel free to reply with any other questions or concerns. Hope this helps!