It's not just a funny joke that attempting to define LDS doctrine is akin to trying to nail Jell-O to the wall. For almost every doctrinal position there are either other doctrinal positions or historical events that go against it (or sometimes both). Even on something as traditionally Christian as the Atonement of Jesus Christ and grace vs. works, the LDS doctrine and previous LDS leadership authorities can be read to support penal substitution theory or satisfaction theory, and you'll find plenty supporting both the supremacy of grace AND the supremacy of works.

Honestly, the best approximation of LDS doctrine is probably not found in any form of text but is best found through the practices of the majority of the active membership. Oh, and the Wikipedia pages are also probably a good place to start, since they can be changed to keep things current with changing emphasis and practice.

Of course, that's not to say that you can't find attempts by LDS individuals and academics to create what you're asking for, it's just that as time moves on each attempt has fallen out of favor as the culture of the organization shifts away on certain items:

1: https://en.wikipedia.org/wiki/Mormon_Doctrine_(book)

2: https://en.wikipedia.org/wiki/Encyclopedia_of_Mormonism

3: https://deseretbook.com/p/lds-beliefs-doctrinal-reference-ro...

4: https://gregkofford.com/products/this-is-my-doctrine