How can I have all my tests and mocks inside a folder "tests" next to my "app" source code?

I currently have all my app source code under app/ and all my tests source code under tests/. These folders follow the same folder structure. Everything is working fine with the following Jest configuration:

{
    "collectCoverageFrom": [
        "app/**/*.{ts,tsx}"
    ],
    "coverageDirectory": "build/coverage/",
    "coverageReporters": [
        "html",
        "text-summary"
    ],
    "moduleFileExtensions": [
        "js",
        "ts",
        "tsx"
    ],
    "moduleNameMapper": {
        "^.+\\.css$": "identity-obj-proxy"
    },
    "modulePaths": [
        "<rootDir>/app/"
    ],
    "snapshotSerializers": [
        "enzyme-to-json/serializer"
    ],
    "transform": {
        "^.+\\.(ts|tsx)$": "./utils/jest-typescript-transformer.js",
        "^.+\\.(gif|jpg|png)$": "./utils/jest-image-size-transformer.js"
    },
    "testPathDirs": [
        "<rootDir>/app/",
        "<rootDir>/tests/"
    ],
    "testRegex": "tests/.+\\.spec\\.(ts|tsx)$"
}

Now I need to mock some modules and the documentation states:

Manual mocks are defined by writing a module in a __mocks__/ subdirectory immediately adjacent to the module.

This means that the __mocks__ needs to be inside the app folder but I'd like to keep everything test related inside the tests folder. But there's the thing, if I have duplicate mocks on both app and tests I get this:

jest-haste-map: duplicate manual mock found:
  Module name: DialpadDigits
  Duplicate Mock path: C:\SampleApp\tests\constants\dialer\__mocks__\DialpadDigits.ts

This warning is caused by two manual mock files with the same file name.
Jest will use the mock file found in:

  C:\SampleApp\tests\constants\dialer\__mocks__\DialpadDigits.ts

Please delete one of the following two files:
  C:\SampleApp\app\constants\dialer\__mocks__\DialpadDigits.ts
  C:\SampleApp\tests\constants\dialer\__mocks__\DialpadDigits.ts

But the only file actually being used is the one under app... How do I know this? Say I have the same mock on both folders and this mock fails my tests and if I don't use the mock, the tests pass. If I remove the mocked module from app, the test passes. Which means the mock from tests is not being used, despite that Jest warning above.

To sum up, how can I have my mocks in the tests folder?