Is it possible to enter vanilla commands via the console?

Hi I know it sounds weird but I was wondering if it was possible to enter a vanilla command via the console of the aternos website (ex: change the weather to clear while entering the command in the colsole or change the game mode of a player while not being in the game)

Thanks for the answer!

I’ve tried /time set day and it apparently didn’t worked

Is there a special entry before the slash?