Time_pattern more like crontab

I am starting with Home Assistant. So maybe, I am missing something obvious.
I am trying to automate some actions based on time_pattern. I wanted something to be done at 19:00, 19:30, 20:00 and 20:30. For the minutes I can use '/30'all good. However for the hours it seems that '19,20' doesn’t work. Basically, I wanted to use a “kind of” crontab syntax, but it appears not to be possible.
Something I didn’t see? Or is the time_pattern (very) limited?
Anyhow, thank you for the great job on Home assistant!!

You could make a condition of the automation that time is between 19:00 and 20:30.

Or you could just (as it is only 4 triggers) list them all in the trigger section.

True. But I have other cases when it is from 8 to 19 at 20 and 40 of each hour.
With crontab it is a one liner. With time_pattern, some more!!

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