myapp/node_modules/@schematics/angular/library/files/ng-package.json.template

{
  "$schema": "<%= relativePathToWorkspaceRoot %>/node_modules/ng-packagr/ng-package.schema.json",
  "dest": "<%= relativePathToWorkspaceRoot %>/<%= distRoot %>",
  "lib": {
    "entryFile": "src/<%= entryFile %>.ts"
  }
}