Hey @swmoon,
Thanks for pointing out that this API is missing in our iOS SDK for the described use-case. Please open a feature request as described here so we can track it internally.
To clarify, did you disable the IMA UI for your ads? (Using ImaAdvertisingConfig.preferredUiType = .disabled)
For Android it should be possible to access the IMAAdsManager through AdvertisingConfig.ima.onAdsManagerAvailable.