How to filter for a specific landmass blueprint brash in PSG.

Hi everyone,
So I am trying to create a landscape using landmath blueprint brashes. So i created few of them for a roads, but I cant tag them or point to them in my PCG volume.

So here are my custom landmass brashes that i added
Screenshot 2024-02-03 121841

I cant add tag to them, but added tags to spline and brush mesh inside of it
Screenshot 2024-02-03 121954

But when I try to get spline data for that tag its not working for me.
Screenshot 2024-02-03 122054

Can someone help with a proper way to create a spline brash that can use PCG or how I should get its spline data in PCG if its possible to do properly?

I was able to select a spline properly using GetSplineData on CustomBrash_Landmass, but this does not allow to referance surface point for this brush final details, which is what I would need (Specifically for open spline as for closed spline I think interior dimention option would do that).