Each struct and its referenced fields can be thought of as a graph which can be sorted.
Ideally, it is a DAG, but sometimes you can have recursive structures so it can be a cyclic graph.
By DAG-ordering a I meant a topological sorting such that you do it by layers of the graph.
Identifiers correspond to nodes and a mention of an identifier in the definition of another corresponds to a directed edge. The resulting graph won't necessarily be acyclic, but you can still use it to inform the order in which you present definitions, e.g. newspaper style starts with the most high-level function and puts the low-level details at the end: https://pypi.org/project/flake8-newspaper-style/
https://en.wikipedia.org/wiki/Topological_sorting
https://en.wikipedia.org/wiki/Directed_acyclic_graph