Izure Saikyou no Renkinjutsushi?
Possibly the Greatest Alchemist of All Time

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More than one person (including the protagonist) is transported, reincarnated, or transmigrated to another world. Includes Group Isekai/Class Isekai. Also Transportation, Reincarnation, Transmigration. Note: this list may hint future character identities in a series.

(PART 2) https://myanimelist.net/stacks/48125

Additional List:
Female Protagonist falls into an Otome Game/Eroge/Game world
https://myanimelist.net/stacks/37528
Male Protagonist falls into an Otome Game/Eroge/Game world
https://myanimelist.net/stacks/37536
Protagonist was thrown into a Novel/Book world
https://myanimelist.net/stacks/37920

The side character is the Regressor/Isekai, the protagonist is not.
https://myanimelist.net/stacks/45493

Protagonist who involves in crafting, forging, blacksmithing, constructing, farming, alchemy. Also Support Class tag.

Healer/Medicine in Fantasy/Isekai
https://myanimelist.net/stacks/48313

Country Building/Conquest/Seige in fantasy/isekai
https://myanimelist.net/stacks/37268
Isekai-Fantasy/Dungeons dragged into the Modern World
https://myanimelist.net/stacks/38406

Additional (currently no MyAnimeList page):
-(Manga) Tensei Renkin Shoujo no Slow Life / Reincarnated Alchemy Girl's Slow Life
-(Manga) Itsunomanika Eiyuu ni naru / I, Who Was Demoted to a Potion Factory, Was Kidnapped by an Elf and Became an Alchemist in a Desert Country (Elf)