Passing variables to task implementation in headless mode?

[SIHranova]

Hello, I hope I am posting in the right repo. I want to ask if it is possible to combine the concept of "experimental variables" with headless mode experiment batteries, because we want to pass information like task key mapping to the experiment implementation.

At the moment we have the following setup: participants register online, they are assigned a key mapping and then they get given the corresponding expfactory link to the task and a token (which I guess means we are running the tasks in headless mode?). The problem is we have to have two separate implementations on different links for the same task, where the only difference is the key mapping of the task. What we would like to achieve is have only one implementation that gets told "this participants should have keymapping x" and then the experiment adapts accordingly and saves this information. Is this possible? I apologize if this is a doubling of a previous post.