app/node_modules/@angular/material/schematics/migration.json

{
  "$schema": "./node_modules/@angular-devkit/schematics/collection-schema.json",
  "schematics": {
    "migration-v19": {
      "version": "19.0.0-0",
      "description": "Updates Angular Material to v19",
      "factory": "./ng-update/index_bundled#updateToV19"
    }
  }
}