An interesting project. Silverfox’s answer for reports and charts should give you what you want.
If you want to get fancy with a chart I tried this.
Enter all individuals as Unrelated individuals
Add a Burial fact with only Row and Plot number in the place field. Make sure this is the last item included in the chart. If you also want to include burial dates add two burial facts, one with the date and one with just the row and plot number, no date. Select Burial Options for the burial fact to turn off the option to include only preferred facts. This will allow both burial facts to be included with the one with row and plot last.
When you create an extended family chart each person will be in a box with no links to any other box. You can now move the boxes around to create a map of the cemetery showing where each person is buried.
This may involve extra work but would make a great chart.