How to combine Levels and Time for Leaderboard logic?

Hi guys. I have some difficulties with leaderboard logics.

Let's say I have few players with maximum level they achieved and time they spent.

For example, three player: Mark achieved level 7 and spent 50 seconds; Eric achieved level 7 and spent 120 seconds; Robert achieved level 5 and spent 80 seconds.

So my leaderboard will look like:

1st place Mark - 7 lvl for 50 seconds

2nd place Eric - 7 lvl for 120 sec

3rd place Robert - 5 lvl for 80 seconds

So, the quation how I may send this data to Firebase or even simple GooglePlay Leaderboard service? In GooglePlay Leaderboard service I have only two logic possibilities "Larger is better" or "Smaller is better" but in my case I have combination of two different info "Levels" and "Time".

Even simpler case, how I combine these two infos in to in game "top player's" array for/or in game Local Leaderboard?

Thanks in advance :)