I think the sentiment behind the question is a great one: the desire to know more and more about Jesus. That is what we hope to spend eternity in heaven doing.
I would just point out, though, that there aren’t going to be any more Gospels. The canon is set. It has been dogmatically defined. Nothing else will be added to it.
Even great archaelogical finds (such as the Dead Sea Scrolls) did not bring to light any new documents of which we were previously completely unaware. It shed light on the documents we already had, but no new documents were uncovered.
Even if a new document were to be uncovered, it would simply be considered apocryphal. It would never be recognized as Scripture because (a) it has been completely absent from Sacred Tradition for 2000+ years and (b) as I said above, the canon has already been dogmatically defined.
Nonetheless, it doesn’t mean we can’t glean spiritual benefits from non-scriptural works. I recommend The Life of St. Joseph by Maria Cecilia Baij. It covers the life of St. Joseph from birth to death (which of course includes the childhood of Jesus). It’s private revelation. You don’t have to believe a word of it. But could it be true? Sure. I found the book very edifying.