If you go with spindles chairs, then stain/paint them with glossy black. Check Ethan Allen dining rooms with Windsors chairs.

This IKEA chair kinda matches the leg work on your table.....

https://www.ikea.com/us/en/p/ingolf-chair-brown-black-60217822/

Windsor is too traditional and cross back would look lovely in black. Love the wishbone chairs

Where are these chairs from?

Wishbones are very popular but prices can really vary. I learned something that when you Google at top if you select Shopping tab a full List of suppliers with pictures can be viewed. You may already know this!

Anyway, I just did this (as my picture was just from Pintetest without any references) and found the company below which was decently priced and chairs come in various colors.

https://bykallevig.com/ca/product/wishbone-chair/?attribute_pa_color=black&gclid=CjwKCAjw7-P1BRA2EiwAXoPWA_CxxhWPRF0GHms3wSDfGXYfwFQSG1ZN2hcGAmlXAVGkTzSUxQ7CcBoC4JwQAvD_BwE

These are cute in black and white -https://www.serenaandlily.com/variationproduct?pid=m10321&pdp=true&utm_source=adlucent&utm_medium=cpc&utm_campaign=adlucent&gclid=CjwKCAjw7-P1BRA2EiwAXoPWA-aqWEPPWZeBjYicWeUS_Pl6ZVrsURgqZFTt-Fw0AnVq2edlq4VOdBoCPXAQAvD_BwE#fo_c=745&fo_k=0a553460e089801cbd6b90ec9db980b1&fo_s=adlucent - Be careful with the wishbone chairs and they usually don't tuck under the table so you need to have enough room

Where is the table from? Didn't that site offer chairs?

I'm not crazy about the Windsor with your table.

I was thinking how the cost of new chairs will add up. How about painting your chairs and leaving rattan as is for a similar look below (add black cushions on rattan). If you don’t have enough chairs they are easily found second hand I found the set below for $30 for example

You could go on Facebook’s Marketplace. I have had great luck. Chairs below were $75 and $50 each respectively and had a large quantity. Never know! Then you have some money for an updated chandelier.

Wanted to give you ideas for ottoman and bookcase updates to better compliment your new room

Thanks but I don’t have room for bookcases and ottomans...

On either side of fireplace?

Oh I see but thanks happy with the other stuff just looking for chairs. Where on earth would an ottoman go?

I thought what you had next to the fireplace was a small ottoman; guess it’s a bench and in addition to the pillows thought a throw could be cute.

People will often comment on more than the actual question and oftentimes it initiates a whole series of comments and questions from poster.

I do hope though that the advice regarding chair styles, the wishbone source you requested, ideas on updating yours or going second hand was found to be helpful. All the best in ending up with the perfect set.