adding simple asis code via validation_files field?

[mariev]

I noticed that it might be nice to include some custom code e.g. pure html, MD, or LaTeX in between the child files without having to write a separate file or break up the input list to vt_file. Is this possible?

Usage in the .yml would be:

. . . 
validation_files:
- req1.md
- testcase1.md
- vt_add_code("## Test Results \n")
- testcode1.R