Support for Custom Slime Chunk Cluster Pattern Filters (e.g. ooo/oxo/ooo)

Hi! First of all, thank you for the amazing tool — it's been incredibly useful in analyzing slime chunk distributions.

I'm currently experimenting with finding dense slime chunk clusters and would love to better understand how the filtering system works internally.

More specifically, I’m trying to locate clusters that match one of these two patterns:

🟢🟢🟢
🟢❌🟢
🟢🟢🟢

or ideally:

🟢🟢🟢🟢
🟢❌❌🟢
🟢❌❌🟢
🟢🟢🟢🟢

Where:

• 🟢 = slime chunk
• ❌ = must NOT be slime chunk (empty center)

I want to implement a filter or detection method that can find this exact formation within a chunk area.

Here’s an example of my current attempt, where I tried to build the structure step-by-step starting from a base slime chunk and linking each surrounding slime chunk relative to it:

Is it possible to define this kind of spatial pattern in the current system?
If not directly, could you point me to where in the code (or logic) this could be implemented or extended?

Any tips or guidance would be much appreciated — especially regarding how to write a custom filter that checks the state of specific relative chunk coordinates.

Thanks again for your awesome work! 💚