1. When you say pork - do you man a pork butt? Or a thinner cut?
2.If not a butt - why not use a jacquard on it then marinade?
3. Better yet - do you have a vacuum sealer or vacuum tumbler? If so - combine 2 AND 3 for the better outcome.
Injectables are typically water thin, to keep you from redecorating the kitchen with an un-intended spray...
And - you would need to strain out any of the solids even if you thin it down that much…..
I think if you really wan to inject, you will be better served by communing real mango juice, and apple cider vinegar, then use some powdered heat - jalapeño or cayenne, habenero…whatever you like.
Have fun with it. Experimenting is how we learn new things - so don't be afraid to "fail"….Or - as Capt' Jack says: Our failures become soft tacos
( And some pretty darn good ones at that!
T