I think it new feature should be added to mblock.
I think you should add serial monitor function like arduino ide to mblock5.
You might be able to use lists, but it’s not very easy to see.
I have confirmed with our engineer, unfortunately, currently there is no plan to add serial monitor on mBlock5 since this software, but still thanks for sharing your suggestion.
Regarding to the list function, normally, it support online program under device mode. Here is a picture to you for reference: