I ran into this multiple times. I got tired of having to spin up a backend to use the OpenAI API and figure out security and analytics per user in my apps so I created Backmesh which lets you safely call any LLM API from your app using a JWT proxy without exposing your API Keys or a backend. Check out the security documentation to learn more. It is also open source and can be self hosted. Happy to help you out on our Discord if it is still relevant or feel free to DM me!