Is this supported by the joplin clipboard API?
It appears that you can only use joplin.clipboard.writeHtml(html);
or joplin.clipboard.writeText(plainText);
to write one or the other to the clipboard
and if you try something like:
await joplin.clipboard.writeHtml(html);
await joplin.clipboard.writeText(plainText);
the second one overwrites the other