Support GIST indexes in `custom_indexes` code block

Do Ash Postgres supports more complex indexes in custom_indexes? Right now I'm using custom_statements for it:

    custom_statements do
      statement :my_index_1 do
        up "create index my_index_1 on properties using gist (geography);"
        down "drop index my_index_1;"
      end

      statement :my_index_2 do
        up "create index my_index_2 on properties using gist (geography(geography));"
        down "drop index my_index_2;"
      end
    end

    custom_statements do
      statement :my_index_1 do
        up "create index my_index_1 on properties using gist (geography);"
        down "drop index my_index_1;"
      end

      statement :my_index_2 do
        up "create index my_index_2 on properties using gist (geography(geography));"
        down "drop index my_index_2;"
      end
    end