This... seems like it might be the best place to put this? I dunno. Not sure if this has been discovered or not, but: I was just in a Ranked Battle at Port Mackerel I was around our side's splat zone, and I decided to superjump over to some teammates making an offense on the other side's splat zone. However, just before I launched to the other side, a teammate near me used the bubbler, and so I got the shield around me and stuff. But when I landed near my other teammates, despite me not being the one to use the bubbler, all of them became protected as well, leading to a very successful takeover of the other splat zone.
I'm not sure if this is something which everyone else already knows about or not, but either way, it seems like a nice strategic option. It might need to be tested, but I'm pretty sure I'm remembering what happened right, anyway.