Bad news! There is no trick as far as I know. You just got to learn them one by one. Maybe say them aloud a bunch to get the reading stuck in your mind
There isn’t really a trick to it so much as each vocabulary word has its own reading. You’re going to have to try and memorize each reading for each word individually. But don’t fret! Once you’ve got it all memorized it’ll be smooth sailing from then on. Making up your own mnemonics can help.
I’m not the expert on this, tho! If someone else has any strategies on memorizing readings, I’d like to hear them too haha