Also, those games are intended for Reinforcement Learning agents, not Humans.

Hi, I'm with the TextWorld team.

TextWorld actually uses Inform7. The framework first builds a game object (e.g. objects, locations, quests) according to some settings. Then, it converts it into Inform7 code before being compiled into a playable game. See https://imgur.com/oOcy5kk

How could you run a TextWorld game in a web browser? Use a Glulx file interpreter like Quixe?

https://eblong.com/zarf/glulx/quixe/

The "try it" example on the TextWorld page uses Parchment: https://github.com/curiousdannii/parchment