Is this route ok?

Lidya,

Both your routes are eligible for 144 hours visa free transit.

Jakarta to Beijing to Hong Kong

You should just take care that your both flights do not have any additional landing within mainland China and be careful that your Jakarta to Beijing flight does not have a landing in Hong Kong

Hong Kong to Shanghai return to Melbourne

Again, your both flights are not allowed to have any additional landing within mainland China and take care that your flight Shanghai to Melbourne does not have a landing in Hong Kong.