How to find collaborators for just writing and formatting manuscripts
Writing the manuscript is a significant scientific contribution. Is your research so trivial that anybody can interpret the data that you give them and write to a high scientific caliber on them, with no further inputs from you? Most likely, you'd need to also provide them with a rigorous analysis of that data, probably in writing form, since they might no share an office with you, and also for record keeping. That explanation becomes the crux of a paper that you could write yourself in the first place. The time spent explaining the data to someone not involved in an experiment will be greater than just writing the thing yourself. You'd be only saving time on tiny matters of sentence formulation, if you'd even save time at all.

Formatting a paper in my experience doesn't take that much time, so I'm not sure where you're coming from in on that point. Most journals provide you with a template that you can literally copy paste into. If something is straightforward as you say, it shouldn't take that much time at all. If by "getting bibliography", you mean compiling the bibliography, that will also be something that only you, being familiar with the experiment, can provide. A bibliography should be something that arises naturally from the need to reference previous methods/works for your analysis, not a chunk that you copy paste between papers without thoughts.

If you mean that they also do the data analysis, then they just become a regular scientific collaborator, with full authorship rights.