How to serve another vector_layer in tilejson?

[zmatez]

I'm trying to put centered labels in Maplibre on geometries, but to do it I need to calculate center points. So to my PostGIS table I've added:

ALTER TABLE maps.terrain_wojewodztwa ADD COLUMN centroid GEOMETRY(Point, 4326);
UPDATE maps.terrain_wojewodztwa
SET centroid = ST_Centroid(geom);
CREATE INDEX idx_terrain_wojewodztwa_centroid ON maps.terrain_wojewodztwa USING GIST (centroid);

but on that table (with both geom and centroid) it says Unable to configure source terrain_wojewodztwa because property 'centroid' was not found. Config looks like:

    terrain_wojewodztwa:
      layer_id: terrain_wojewodztwa
      schema: maps
      table: terrain_wojewodztwa
      srid: 4326
      geometry_column: geom
      properties:
        gid: Integer
        jpt_nazwa_: String
        centroid: Point

so sounds like it can't serve two geometries (multipolygon and point) at once - so how could I serve this as one endpoint, but in TileJSON it'd give me both geometry and centroid in separate vector_layers:

"vector_layers": [
    {
      "id": "terrain_wojewodztwa",
      "fields": {
        "gid": "Integer",
        "jpt_nazwa_": "String"
      }
    },
    // here another layer just for centroid, with same gid and jpt_nazwa_
  ],

is it possible or I have to create separate endpoint like with different table or function to serve centroid separately? Thanks

[zmatez]

Alright so solved it like this:

  tables:
    terrain_wojewodztwa_polygon:
      layer_id: terrain_wojewodztwa_polygon
      schema: maps
      table: terrain_wojewodztwa
      srid: 4326
      geometry_column: geom
      properties:
        gid: Integer
        jpt_nazwa_: String
    terrain_wojewodztwa_centroid:
      layer_id: terrain_wojewodztwa_centroid
      schema: maps
      table: terrain_wojewodztwa
      srid: 4326
      geometry_column: centroid
      properties:
        gid: Integer
        jpt_nazwa_: String

would be cool tho if those could have the same name, but it's alright to call 0.0.0.0:8000/terrain_wojewodztwa_polygon,terrain_wojewodztwa_centroid