Tomb of Horrors - Under Construction is part of Infernal Machine Rebuild module from Wizards of the Coast - https://www.dndbeyond.com/marketplace/adventures/infernal-machine-rebuild.

Maximum "integration" can be had if combined with FoundryVTT (https://foundryvtt.com/), module for the map is at https://www.pariahzero.net/VTT/tomb-of-horrors-under-construction/module.json.

The DDB Adventure Muncher module (https://github.com/MrPrimate/ddb-adventure-muncher) for FoundryVTT and purchasing the adventure D&D Beyond can provide even more integration.