Worm Holes and gravitational microlensing

[javisot20]

You could take the Morris-Thorne wormhole, but it's a vacuum solution... like all of them (I think). At that point you should be lax if you want to write the novel.

M. S. Morris and K. S. Thorne, “Wormholes in spacetime and their use
for interstellar travel: A tool for teaching General Relativity”, Am. J.
Phys. 56, 395 (1988).

https://arxiv.org/abs/gr-qc/0302049

Now that I think about it, have you considered copying the movie Interstellar at certain points? It is a good reference for what you are looking for

 

[xeyro]

Typical wormhole idea is very sci-fi. Compare to 'time-travel' sci-fi, and an atomic clock verifying relativity. What is looking for a wormhole? It is a fictional idea. A wormhole is more likely to be tiny, compared to the sci-fi idea of a wormhole. Sci-fi idea is like millions of light years across space. More like the observed distances in Einstein rings, adjacent Galaxy, or far more tiny than one Galaxy.