i am trying to add @superset-ui/legacy-plugin-chart-sankey-loop\n<https://www.npmjs.com/package/@superset-ui/legacy-plugin-chart-sankey-loop>\n\nDefined below in respective files\n```import\u00a0SankeyLoopChartPlugin\u00a0from\u00a0'@superset-ui/legacy-plugin-chart-sankey-loop';\n\u00a0\nnew\u00a0SankeyLoopChartPlugin()\n\u00a0\u00a0.configure({\u00a0key:\u00a0'sankey'\u00a0})\n\u00a0\u00a0.register();```\ni am successfully able to start seeing Sankey Loop in chart list, but while creating the chart i don't see various sql drop down like metrices, filter, group by etc\ncould you please suggest if i am missing something in the integration