I wanted to quickly try the solution and respond, but I ended up going down a rabbit hole.
The Froala editor used by XbyK is customizable, and its Link plugin includes the linkStyles option, exactly what you asked about. Since the documentation mentions that XbyK bundles most of Froala’s plugins, I thought it would just be a matter of adding linkStyles to the editor config. Unfortunately, that didn’t work.
After doing some more research, I found that the Link plugin is most likely not bundled with XbyK, as the link button doesn’t appear even when I include insertLink in the toolbarButtons config option. My assumption is that since XbyK implements a custom plugin, @kentico/xperience-admin-base/Link, for inserting links from within the system, the default Froala Link plugin might have been excluded, either because it’s redundant or due to potential conflicts between the two.
Anyway, I also tried adding the linkStyles option in the @kentico/xperience-admin-base/Link plugin config, but that didn’t work either. I assume it doesn’t implement such an option.
I’d recommend reaching out to the support or consulting team to shed more light on this, and suggesting an improvement to the documentation to list which plugins are excluded and why.
