Registering a new table with a coordinate system #573

Hi there.

I am playing around with Spatialdata and the Visium HD release and I want to do the following:

I have a Spatialdata object created with spatialdata.io.visium_hd and annotations from Napari.
I also have a new anndata object from this dataset that I created by segmenting the HE image and assigning bins to Nuclei.
This anndata object has (X,Y) centroids of segmented cells in adata.obsm["spatial"]

How can I correctly add this as a new table to the sdata, such that polygon_query will operate on the (X,Y) centroids?
Is it necessary to add the segmented shapes to which the centroids belong first?

I tried:

adata.obs["region"] = 'Visium_HD_Human_Colon_Cancer_nuclei'
table = TableModel.parse(adata, region="Visium_HD_Human_Colon_Cancer_nuclei", region_key="region", instance_key="id")
sdata.tables["nuclei_segment"] = table

But polygon_query removes the new table from the returned object.

Thank you!