Hi @MDag97,
pandas (and anything that is not base Python) can not be auto-translated to Javascript, as far as I know.
I think you will need to generate the seq_csv files in advance and add a Code Component in the beginning of your experiment that randomly selects one for each participant.
I have a similar issue for my task and I will try to either run participants with the same configuration in small batches or continuously update the conditions file while the study is running (see my related question here).
Hope that helps!