How do I run ldgen.py independently of IDF.py and CMake?

[KarlBrosner]

I'm currently in the process of supporting the esp32s3 chip for another GCC Compiler Collection language. I would like to create a set of configurable build scripts for the esp32s3 based on the files in esp_rom. I've copied the esp_rom folder to my application directory, including the linker.lf file. It's unclear how to run ldgen.py without using IDF.py or CMake.