Reverse proxy on Bubble

I have a domain in Godday and I hosted my bubble app by build-in bubble service
I have a REST API in node.js & Express that populated on elastic beanstalk by AWS,
I want my backend will be a subdirectory of my domain e.g my domain is
so my backend will be in www.
i want to active this by nginx reverse proxy , this is possible with Bubble?
or there is another way to achieve this.
Note the rest will be service for more platforme.