SUNION for all keys with the same pattern in Redis

I have n keys with the same pattern key:abc:<id> that store unsorted set. I want to do the union for them all, but according to Redis documentation (https://redis.io/commands/sunion) I can only specify separate keys in the command like SUNION key:abc:1 key:abc:2 key:abc:3

I want something like SUNION key:abc:*