schematics "ng-add" not found

[BhaskaranR]

ng add @loona/schematics on a nx workspace gives me this error

Error: Schematic "ng-add" not found in collection "@loona/schematics".
    at SchematicEngine.createSchematic (/Users/bhaskaran/kmeal-frontend/node_modules/@angular-devkit/schematics/src/engine/engine.js:232:23)
    at CollectionImpl.createSchematic (/Users/bhaskaran/kmeal-frontend/node_modules/@angular-devkit/schematics/src/engine/engine.js:69:29)
    at AddCommand.getSchematic (/Users/bhaskaran/kmeal-frontend/node_modules/@angular/cli/models/schematic-command.js:130:27)
    at AddCommand.runSchematic (/Users/bhaskaran/kmeal-frontend/node_modules/@angular/cli/models/schematic-command.js:262:32)
    at AddCommand.run (/Users/bhaskaran/kmeal-frontend/node_modules/@angular/cli/commands/add-impl.js:48:31)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)