I like the rattan chair better than the white. If it were my kitchen, I would gravitate toward a darker, wood chair to help balance the color scheme. There is too much trying to match and not enough contrast.

My next priority would be getting a colorful kitchen rug, a runner for the main part of the kitchen. The space under the table seems cramped for a rug and once you have chairs there, I am not sure a rug will make much of a difference.

I hate sitting on rattan I like the white one with the wood legs. IMO you do not have space for a rug. P put a great piece of art on that wall the bigger the better and a nice vase of fresh flowers on the table , done. I do not like rugs in kitchens they are jusr tripping hazards and one more thing to wash.

I have a bunch of pics to show you, various looks to see what you think.

I like your idea of adding color with a rug, but wasn’t sure what colors you prefer. I saw this one, but you could certainly go much more bold and colorful in such a neutral room.

https://www.loloirugs.com/products/kv-03-mh-sand-ocean

I’m using one of your white chairs, but I really like that chair in black. I think it balances things nicely, while giving a bit more oomph factor. :)

I did two views, to show thing in relation to the kitchen, too.

Next I saw this patterned jute rug and really like the texture it brings to the room. It comes in several different patterns, as well —

https://www.houzz.com/products/jute-round-tribal-circle-black-print-8-round-prvw-vr~114926852

Reached the picture limit ... I also did brown chairs. I like this look, too.

https://www.houzz.com/products/poly-and-bark-paxton-dining-chair-set-of-2-tan-prvw-vr~139884290