Dear Veronica,
Unfortunately, this seems not possible.
So, either you trust in your LTI consumers for putting this parameter, or you create an issue about this in the Moodle Tracker .
Best,
Max
General help
LTI Custom Parameters
Гэтае абмеркаваньне было заблакавана, таму вы болей ня можаце адказваць на яго.