I don't exactly know your application or intent. You wrote that you've not used your R5 for videography. My assumption is therefore that videography is also new for you.

I recorded video for years before I paid attention to audio. My goals were distant wildlife and the only audio needed was background music added in post. That changed when I moved to a retirement community and people showed up in front of my camera.

So depending on where you go with video, I think you "need" one of the four smaller camera mounted Rode mics. (https://rode.com/en/about/news-info/audio-for-film-101-which-video-microphone-is-best-for-you-rode-videomic-comparison) My current choice would be the versatile "VideoMic GO II" over the more expensive "VideoMic NTG". What I have is the lowest cost VideoMicro that does work well.

I also think you will find you will "need" a wireless mic like the Wireless Go II or DJI equivalent. Nobody that records people will do without something that clips to their shirt, lapel or collar.

Do you "need" an independent recorder like the Zoom H1n? That will depend entirely where you go with your video recording. In my case, I have a small, compact audio bag. In it are the three pieces of gear I'm talking about. There is also a few adapters, brackets and lav mics. Depending on what I'm doing, any part of that kit might be needed.

The answer, as in everything, depends on what your expectations are for the soundtrack.

Are you narrating as you film?

Are you just hoping to record some ambient sounds?

Are you hoping to record conversations more than three feet away, or more than two feet away in noisy locations?

What is your budget for audio?

Are you going to edit the video in a non-linear editing suite?

There are tons of options ranging from cheap, wired lapel mics to wireless systems costing hundreds or thousands.