The "g" sound is a hard consonant, while the "j" sound is a soft consonant. There is no way to pronounce the "g" sound as "j" in English.
However, there are words that start with "g" that sound like "j" in multiple syllables, such as:
* "gentle" (pronounced "jen-tl")
* "geography" (pronounced "jee-og-ra-fee")
* "ginger" (pronounced "jin-jer")
Let me know if you have any other questions.