from qgis.core import *
from qgis.gui import *

@qgsfunction(args='auto', group='Custom')
def dump_table(geometry, feature, parent):
    nodes = geometry.asMultiPolygon()[0][0]
    template = """
    <style>table, th, td {{ border: 1px solid black; }}</style>
    <table>
    <tr>
        <th>PlotNo</th>
        <th>No.</th>
        <th>X</th>
        <th>Y</th>
        </tr>
        {}
    </table>
    """
    rows = []
    for count, node in enumerate(nodes):
        row = """<tr>
        <td>{}</td>
        <td>{}</td>
        <td>{}</td>
        <td>{}</td>
        </tr>""".format(feature['PlotNo'], count, node.x(), node.y())
        rows.append(row)
    return template.format("".join(rows))