Before anything, I MUST say thank you.
This mod is something that I have been looking for for a long time. Thank you so much.
My use case is: I don't like trains and I want to just teleport stuff from my mining outpost to my bases, and this mod allows me to do that painlessly and without killing all the fun in the game.

Now for the actual post / request: would it be possible to create something like a "linked pipe" so that we can also teleport fluids from outputs to the main base?

There is no build-in entity that supports this. All solutions that try to implement this are pure Lua solutions that consume UPS.
Have a look to https://mods.factorio.com/mod/Kux-SolidifiedFluids. this could be a workaround for you.
if not, there ist a mod 'Linked Chest And Linked Pipe' but I didn't take a closer look at it

Understood. Thanks for the explanation, it makes sense.

if not, there ist a mod 'Linked Chest And Linked Pipe' but I didn't take a closer look at it

Can't recommend it.. terrible UPS.