ISED has published Notice 2020-DRS0019 that covers “Guidance for RF Exposure Assessments of Portable Devices with Wireless Power Transfer (WPT) Capabilities.” The full text can be seen here, and in addition to the assessment methods outlined in this notice it should be noted that:
It is important to note that WPT-enabled portable devices do not meet the condition for exemption from routine evaluation outlined in section 6.4.4 of RSS-216. In addition, they should not be treated as table-top devices, since charging may occur when the devices are in a body-worn configuration.