Insert/append items in DataCatalog

[yu-feng-ho]

I am working on skmap.catalog.DataCatalog. The only way for me now is to create/update a excel sheet by google sheet or csv. I am wondering if I can have a functionality to insert/append a item such as

catalog = DataCatalog.create_catalog(catalog_def=mysheet, years=[], base_path=base_path)
catalog.update('{common': {'new_layer': {'path': new_layer_path}}}'

It would be helpful at the case if the static catalog can be imported and then customized by inserting new object.