• See Allow changing the position of the code console prompt cell, add settings and toolbar items jupyterlab/jupyterlab#13837 and Update to JupyterLab 4.4.0a3 and Notebook 7.4.0a2 jupyterlite#1570
• Documented in Expose more REPL options via query string parameters jupyterlite#1573
• See also [wip] Make REPL URL params extensible jupyterlite#525

This will require relaxing the jupyterlite-core requirement to be relaxed when 0.6.0 stable is released upstream.