Advmemo Region Definition

I am trying to define a code-folding region that is defined by the start of the file. There is no particular keyword that defines the start of the file but there are defined keywords that can terminate the region,

For example:

Some random text
even more text
even more...
KEYWORD THAT DEFINES END OF REGION ABOVE
========================================

Is there any way to define the start of the file as the beginning of the region? Is there a workaround? So that I can fold whatever happens to appear before the first keyword?

Thank you!

Sorry, there is currently unfortunately not a setting for a region that starts without a keyword. All regions need a start & end keyword.