[1.17] How to register a StructureFeatureConfiguration for a new structure?

[SDOAJ]

All of the examples I can find in other mods of doing so set StructureSettings.DEFAULTS to a new ImmutableMap:

• https://github.com/xyroc/DungeonCrawl/blob/1.17/src/main/java/xiroc/dungeoncrawl/init/ModStructures.java#L85
• https://github.com/TheGrimsey/StoneholmForge/blob/main/src/main/java/net/thegrimsey/stoneholm/SHStructures.java#L26
• https://github.com/FINDERFEED/SolarCraftRepository/blob/master/src/main/java/com/finderfeed/solarforge/world_generation/structures/SolarForgeStructures.java#L75

However, that field is final for me:

Is this field supposed to be final? Is there a different way of registering structures that I don't know about?

The class which I am trying to register the structure in can be found here.

Edited September 11, 2021 by SDOAJ
formatting

[LaDestitute]

Yes, you need to use an access transformer.