Set password to start Jdownloader 2

Hello, I recently purchased an Asustor NAS and installed “docker” and portainer for container management. The question is about jdownloader 2 (container), but I assume it can be applied to other applications. From what I’ve read, I can add or modify some aspects of the program with portainer and stacks. The question is that I would like to add a user and password (and have it saved in the container itself for security) for each time I start jdownloader 2. Is this possible? And how is it done?
I’m new to this and the truth is that any management is a pain for me. Thanks

A password to what? To log in to jdownloader on a web interface? I don’t know jdownloader, but I wonder how it is related to Dcoker.