Any option to have the Editor contain pre-filled text, which is not read as a part of the input?

[KSR001]

Hi,

Is there a way for Editor to currently have a pre-filled text(like directives provided to the user for the data that they enter), but is not read as a part of the variable?
For Eg, something like this, where the user may enter << USER INPUT >> but doesn't change/ disturb the upper part of the file.

#######################
Please enter the required data in this editor, and save the file once done.
Note that the file will be saved as a temporary file.
#######################

<< USER INPUT >>