Instead, you'll need to spawn it into the game using cheats. Here's how to get a command block in Minecraft, using either Java or Bedrock edition.

This command allows you to place any structure from the game which includes mobs, items, and all the in-game structures. Earlier, it was called “/placefeature” but that changed with the 1.19 ...

Minecraft 1.19 saw the addition of the Mangrove Swamp and Deep Dark biomes, as well as a brand new mysterious structure that generates within the latter biome, Ancient Cities.