I ate at Jollibee the other day. The J character is not present in Baybayin. One technique to get the J sound is to combine characters. In the example below, I use the DA & YA characters with kudlits making it DI-YO-LE-BE. One could have also used a combination of a vowel cancellation D & YA to get the sound. Depending on the word, the HA or even GA could be used.