Hey,
we´re working on a project for AEM 6.5 adaptive forms and we need to create custom components. The customer needs to style these components with the help of the themes editor and apply different themes to their forms.
As long as we can handle all styling of the components inside the themes editor (styles handled in the themes-json) there is no problem. At some point we need the help of some LESS which is included inside a clientlib connected to the theme. (e.g. there is no possibility to style link tags inside the theme editor...)
I can add the custom classes with the help of the styleConfig node, but the changes are only available inside the theme editor and not in the adaptive form using the theme.
Is there a documentation how to include custom components with custom styles in the theme editor with best practices or is there anybody who did more than changing some colors or sizes of the ootb forms components? 
(I know the standard documentation, but that handles only very simple use cases)
In the end we want to have a base layout written in LESS which is displayed in the theme editor and the form and the possibility to change some colors or other properties in the theme editor 
Best regards
Alex