If you are adding the Integrity API to Firefox for Android, there should be an easily user-accessible option to disable reporting integrity. This is privacy-related information, because it can be used as part of a strategy to fingerprint my device. It should be up to the user whether or not this information is reported, and the user should have to opt in when first using the browser.
I, personally, cannot comfortably use a browser that has the Integrity API and which does not allow me to disable this reporting.