Gravity forms exports multi row list entries as:

"field name 1","field name 2"...,"field name n"
"list row 1 column1| column2","list row 1 column1| column2"...,"list row 1 column1| column2"

Where 1 - n are the max total number of rows. To then import these entries you have to manually convert these columns into a JSON array. This isn't easy for non techy people so would be great if GravityView entries import could recognise these and let you group them as a single list item.