I have a domain like domain.com

I have a Web API (Laravel) at domain.com/api

I have landing page (Laravel) at domain.com/

I have blog (Laravel) at domain.com/blog

I have Web App (NuxtJS) at app.domain.com

I want to merge domain.com and app.domain.com into one. What do I have to do to achieve that?

My server uses Nginx and Centos 7. Thank you so much for reading my question!