Caprover Path For Shared Folder

I have a Caprover server with a Wappler app deployed to it.
I’m using an SSL cert to authenticate with the database, and the path is defined in the ENV.

From the Caprover docs:

The directory /captain/data/nginx-shared in your server is available in your nginx container as /nginx-shared . Let’s say you place a custom SSL cert in that folder and call it /captain/data/nginx-shared/custom-cert.pem . In order to reference that file in your nginx config, you’ll use /nginx-shared/custom-cert.pem

Wappler defines the system path in the docker file though:
ENV PATH /opt/node_app/node_modules/.bin:$PATH

Can I define the path from the root directory of the server to the SSL cert in the shared folder via ENV?

I tried multiple things like for example:

../../usr/share/ca-certificate.crt

but that is invalid:

{"status":"500","message":"path.toSystemPath: Invalid path \"../../usr/share/ca-certificate.crt\".","stack":"Error: path.toSystemPath: Invalid path

Any help would be appreciated.