Question: single cert for all sub domains

[fjsosa]

Hi, Is it possible to create and use a single wilcard certificate for all my containers? example: *example.com for => system1.example.com, system2.example.com, etc. how I can configure each env-var container to assign the same certificate for all of them. Thank you so much in advance.
Currently I'm using one cert per container an I reach the limit of 5 cert creation per date.

Thanks,
Fernando.