BB, don't worry about the "ch". Look my sentence
Note: that the letter "j" should be pronounced as the "h" in "hammer" as the caribbean pronouniation is. In Spain and Argentina it's pronounced as the german "ch" as in "Bach".
Since this is a caribbean (Cuban) song, use the caribbean "h" instead of "j", as in the English word "hammer". And even in Spain and Argentina an "h" pronounciation will be welcome as a regionalism.
When you find a literal "ch" in the lyrics, just pronounce it as in English, for example Echar should be EH CHAR. The letter that as a Spanish pronounciation similar to the german CH is the J, not the ch itself. I hope you are now well confused.
What did Rick say ?
Un abrazo - Andrés