Duotones on color options page

[glerner]

https://fullsiteediting.com/lessons/theme-json-color-options/
theme.json works as described, so I'm guessing the issue is how duotones are (not?) applied on that page.

Probably good to mention on this page that to apply a duotone, use the image block's "hover menu" circle icon.
I thought my theme.json duotone section was incorrect, since doutone didn't appear in the image block settings.

I would like to see Duotone as part of the Image Block settings panel, just like background color and gradient are for paragraphs and columns. (I know that is not a theme.json question...)

Is there a way to specify duotone for featured images in theme.json, maybe with a setting per page for which duotone to use? https://wordpress.org/themes/wei/ does this.

p.s. Here's the duotones I am defining (using the hex color codes for my primary and secondary dark colors and lightened versions of them).
"duotone": [
{
"colors": [ "#000000", "#ffffff" ],
"slug": "duotone-foreground-and-background",
"name": "Foreground"
},
{
"colors": [ "#0068a7", "#9ddbed" ],
"slug": "doutone-primary",
"name": "Primary"
},
{
"colors": [ "#20828c", "#cfe7c7" ],
"slug": "duotone-secondary",
"name": "Secondary"
},
{
"colors": [ "#0068a7", "#cfe7c7" ],
"slug": "primary-and-secondary",
"name": "Primary and Secondary"
}
],

[carolinan]

Hi
I am struggling to understand what is asked here.
No, theme.json does not have any per-page or per-post settings.
Yes, you themes can add custom controls, you can use the Wei theme as an example and copy code from there.