Maybe not but there’s enough demand for this information to incentive third parties to develop / leverage the technology so that it can be captured i.e. through OCR for example. Once the technology’s there, I expect the supermarkets will share the information themselves to increase customer stickiness, just as they have for online shopping, by showing you your previous purchases.
I don’t think your bank is interested to be honest & if you’re worried about privacy, banks already look after some of the most sensitive personal data that you create. But Monzo wants to make this sort of data available for it’s users so that they can leverage it, transaction categories being the first step.