Schema/Filter Questions

I used the filter to override the schema.org/article to become schema.org/videogame which works perfectly.

However for it to validate I need to inject additional schema the only one missing is one of the following.

<meta itemprop="https://schema.org/applicationCategory" content="Game"/>
<meta itemprop="operatingSystem" content="Web Browser" />

Is it possible to apply a filter to add the additional markup or is it better to try and fetch all the information and use JSON LD?

https://www.ads-software.com/plugins/wp-postratings/