If you want to chunkload an area that is pretty easy to do, the Anchored Pearl loads a 3x3 area of chunks around itself. But be warned the Anchored Pearl is not tamed so easily.
The pearl is only able to stay in the same place for so long by itself, it stays in the same place for up to an hour. After that it teleports away, leaving a kind of ghost imprint behind. This ghost imprint can be used to find where the anchored pearl teleported to (right click on it).
The Anchored Pearl can be kept in place so it doesn't teleport away by constructing a frame around it. The frame is made by making Anchored Frame blocks and making a 3x3x3 structure with the pearl in the middle
You hereby have my permission to use this mod in modpacks