I recently read that devs officially added Blood Infusion, Cursed Blood infusion, Oil infusion and Cursed Oil Infusion to be used for summoner Incarnate.
There is no mention on the Divinity 2 pedia about these skills and i was unable to find a detailed patch history from 2019 for Divinity 2 to check has it been officially listed anywhere.

I tested it myself (only had minor mods and larian gift bags enabled like Crafter Kit and Pet Power) so its definitely a part of the official game:

Blood Infusion (summoner book + necro book)
Cursed Blood Infusion (source summoner book + necro book OR summoner book + source necro book)
Oil Infusion (summoner book + geo book + oil barrel)
Cursed Oil Infusion (summoner source book + geo book + oil barrel OR summoner book + source geo book + oil barrel OR source summoner + source geo + oil barrel).

KEEP IN MIND NOT ALL SKILL BOOKS ARE VALID FOR THESE RECIPES!

For example i could not make any of these using the Inner Demon source summoner book.
Try with several different books from the adequate spell schools - it will work.
Enjoy your new Incarnates :)

****Just to make it clear these new Incarnate infusions seem related to the official Larian gift bag called Pet Power so you will have to enable that in the main menu (after you start/load a game).