We are looking to rewrite an existing addin using the javascript addin api and need to be able to format the characters in a range in the way that is currently possible through the COM API.
Specifically our use case requires setting the Font properties on a range of characters to use them as info graphics.
This is the COM API I am refering to: https://docs.microsoft.com/en-us/office/vba/api/excel.range.characters
This doesnt seem to be possible currently, so I'd like to request adding this to the javascript api offered.