I think the best way to implement this would be to have a new option in preferences that is opt-in by default, specifying whether users want links in external apps to be opened in a quicklook-esque fashion. The exact same way Arc browser is doing it.
FWIW I have used this feature from Arc browser quite a lot, and I understand @Vlad's hesitation to implement this feature, as someone who also often bulk opens links from external apps. That being said, I also think for users that do not bulk open links in external apps, this is a very handy feature that will definitely be worthwhile implementing correctly.
This is why I think having the opt-in option in preferences is the best way going about this, the users that this feature would annoy, would never know about it, and the users that want it, can choose to have it enabled.