I did some additional research about your printer. It appears that it uses non-standard file formats for printing and therefore requires that you use the provided software. I apologize for my error. More searching discovers nothing regarding adjusting z-hop for that slicer software. After re-reading the user manual, I discovered a "lower bed" option but it only applies when using treelike supports, and is not what I would consider a general feature of printing.

There was a link for a user who created a program that would take g-code from Slic3r and convert it to be able to use in a Flashforge printer, but I felt it was too complex for me to suggest as a solution.

Unfortunately, I do not see an easy answer to this question.