Sadly the All of Us program (of which I am a research subject [and researcher]) hasn't done any sort of imaging or ECG. They did draw blood, so that allowed for genome sequencing. That may also, in principle, allow for assaying new biomarkers (I don't believe anything like that has been funded though).
All of Us is great for disease labels and for genetic validation (and discovery). I like it a lot. I just have... ideas for how they could make it more valuable. Ideas that I stole from Rory Collins. https://www.ukbiobank.ac.uk/media/gnkeyh2q/study-rationale.p...
The imaging reports are being imported, but not the images.
The bigger issue is that clinical imaging is done due to medical indications. Medical indications dramatically confound the results. A key element of the UK Biobank's value is that imaging and ECG are being done without any clinical indication.