Org mode: how to set a deadline to an already appointed meeting date

Question

I'm kinda new to org-mode and I was wondering whether it is possible to set a deadline for a TODO task to a meeting date? I try to be more specific in the following:

I have a meeting org file within which I keep all my meetings dates under headlines (ie. no SCHEDULED nor DEADLINE): appointments.org :

* Meeting with boss <2021-01-25>
* Meeting with John <2021-02-03>

What I would like when associating a DEADLINE date to a TODO in another org file, is to interactively select a specific meeting that my task corresponds to in my appointments.org (in that case 'Meeting with boss'). This way, the date of the TODO DEADLINE could be dynamically linked to that of the meeting: should the meeting's date change, the TODO DEADLINE would also shift:

* Tasks
** TODO Do something for boss 
DEADLINE: <????-??-??> <-- select "* Meeting with boss" within appointments.org
** Other Task

So far nothing like this showed up in my researches, at least no "build-in" features.

Thanks for any feedback on this!