I use Google structured Data (GSD) plugin from Tassos.
There I can set a CSS class for FAQ Question and one for FAQ Answer. GDS then will look for them in FAQs.
Unfortunately it's not working with Tabs & Accordeons.
Tassos did a lot of investigations. Here is what he has sent to me:
After some further testing it appears that 'Tabs and Accordions' is not compatible with GSD's FAQ Item. The problem rise's from the fact that 'Tabs and Accordions' replaces it's shortcodes (anything between the /slider tags) with proper markup after GSD has finished looking for any relevant content. This is why the FAQ structured markup is not generated.
To be 100% certain that this conclusion is correct, you can try contacting the developers of 'Tabs and Accordions' and ask them whether or not their plugin listens for the 'onContentPrepare' event during it's lifecycle. By supporting this event, it will be possible to overcome this limitation.
Does your plugin listen to onContentPrepare event?