You ask if it's acceptable for you to provide graphics such as maps and charts. Sure. But first you must carry out two checks. First, be SURE your target publication uses maps and charts, and make sure these are relevant and interesting maps and charts. Secondly, make sure you obtain permission to publish them from the owners of the copyright, and put a note at the end of the article about who owns copyright and the name of the person who verbally or in writing gave you permission to re-print their copyright material.
Let me build on both of those checks, because graphics can lift a story or sink it, depending on how you handle them.
On usefulness: a map or chart earns its place only when it shows something words struggle to. A map is worth a hundred words when the story turns on where things are: the route of a proposed road, the spread of a flood, the three towns affected by a closure. A chart earns its keep when the story is about how a number has moved over time, or how one thing compares with another. If the graphic merely decorates, or repeats what the text already says plainly, leave it out. A cluttered or pointless picture insults the reader.
On copyright, take my warning seriously, because this is where beginners land in real trouble. You cannot simply lift a map off another website or a chart out of a report and run it. Someone owns it, and using it without permission can cost your editor money and you your reputation. Always ask, always get the yes in writing if you can, and always credit the source exactly as they require.
One more tip. If you cannot clear the rights, you can often make your own simple version from the underlying facts, a rough map you draw, or a plain chart built from public figures, which you then own outright. Just be sure your home-made graphic is accurate, because a wrong map is far worse than no map at all.