This is a different problem and disciplin. I'm not an artist. I can't design anything pretty. But I can learn a programming language (or CSS) well enough that I can replicate something an artist designs.
We have an entire design org that produces pretty UIs. FE developers are then expected to know the CSS rules to build that design.
The very first thing I teach new FE developers is how to build from Figma designs.
IMO, this particular division of labor (design/specification) introduces a rather unacceptable level of friction.
It is a feature, not a bug, that when the design and specification work is being done by the same person, the designs tend to be ones that are relatively straightforward to specify. It makes it a conscious choice to budget more specification effort towards elments that are more important to the designer.
We have an entire design org that produces pretty UIs. FE developers are then expected to know the CSS rules to build that design.
The very first thing I teach new FE developers is how to build from Figma designs.