In this case, the ANT+ product certification process will contain two technical sections:
1) The ANT+ mobile platform test for the watch. This is mandatory in order to support third party apps.
2) ANT+ device profile test for the preinstalled ANT+ app.
How you apply for the app depends on the business case. If the pre-installed app will only be available on this watch, then you can certify it as an integrated part of the watch (a separate application will not be needed).
However, if it will be available as an independent app, then you must submit a software certification application to certify it separately as it is considered a separate product.