But D&D has algo homegrown good ideas, for example the kaorti, the Neh-Thalggu or brain collectors, the cranial escynter or the ethergaunts from Fiend Folio 3rd Ed.
And now Lovecraft's work is public domain now, more 75 years after his death. It can used by 3rd party publishers. Pathfinder monster compendium and Starfinder alien archives have got some creatures from Lovecraf's mythos.
And most of D&d players want to kick-ass monsters, not tragic stories about helplessness against unknown primal forces from the void of the universe. D&D stories styles is more "if you use a Deathstar then I will Luke Skywalker with a X-Wing". Players want to defeat their own fears and to learn to have the right balance between self-criticism and faith in oneself. Even Ravenloft or Dark Sun, the darkest lines of D&D worlds have enough space for noble heroism and hope in a better future.
* If WotC publishes a new edition d20 Modern you can bet they will want its own spiritual successor or the Call of Cthulhu, something like the setting "Dark*Matter"