Need help how to calculate pbs in genome by windows way

[ChenDepp]

hi @all

  I have a VCF with three populations. I use sg.pbs to calculate pbs. I got the pbs values, but I want to get CHROM 
BIN_START BIN_END PBS four column tsv file. can you tell me how to get it from res object?
Below is my code

ds = sg.load_dataset("All.filtered.maf0.05.miss0.2.biallelic.zarr")
ds["sample_cohort"] = xr.DataArray(new_store_samples, dims="samples")
cohort_names = [f"Group{i}" for i in range(1, 4)]
ds = ds.assign_coords({"cohorts_0": cohort_names, "cohorts_1": cohort_names, "cohorts_2": cohort_names})
ds = sg.window_by_position(ds, size=100000, step=50000)

res = sg.pbs(ds)["stat_pbs"].sel(cohorts_0="Group1", cohorts_1="Group2", cohorts_2="Group3").values
 ```
Waiting for your reply. thanks all!