def make_form_meta_block_indicator(spec, column_id=None):
    field_name = spec[0]
    if isinstance(field_name, basestring):
        field_name = [field_name]
    data_type = spec[1]
    column_id = column_id or field_name[0]
    return {
        "type": "expression",
        "column_id": column_id,
        "display_name": field_name[0],
        "datatype": get_form_indicator_data_type(data_type),
        "expression": {
            "type": "property_path",
            "property_path": ['form', 'meta'] + field_name,
        }
    }
Return a data source indicator configuration (a dict) for the given
dataset/ETHPy150Open dimagi/commcare-hq/corehq/apps/userreports/reports/builder/__init__.py/make_form_meta_block_indicator