What do the "Return" and "Tree of Life" mean?

The keywords are included in the foldout, but it's after the minor arcana section.

Sorry we haven't been able to add them to the app! Our app is structured so that all our tarot decks are connected to the same source, meaning it's really difficult to make changes or add new cards...

For more detailed meanings, here's what we can share with you.

Tree of Life:
The Tree of Life represents the principle and universal laws that create reality - it is what sustains all worlds in each and every moment, and directs the eternal flow of time and energy - which is ever changing and dynamic. Like a fractal, the Tree of Life is an eternal emanation of the divine principle - it is macrocosm and microcosm; it lives and emanates within each and every human being, and together, we all form the branches of its tree. The sinewy pathways woven by its branches and its roots is what life and energy travels in order to make itself manifest as matter. If you follow its path downwards, you find in it your own body, and if you follow it upwards, you find the divine source of the soul - and therefore it can be thought of as the blueprint for creation.

The Return:
As children, we are born with a certain kind of innocence. We were free from obligations, social norms, other people's expectations; we were free to explore and play and delight in simply being ourselves. It is only as we go through adolescence and then adulthood where we learn about others, about what it means to be empathetic and respectful of those that we meet and the world in which we live. So too, we also learn what we `should` be doing - about what is `right` to do, about what makes someone a `productive`, or `good` in our respective cultural views. We learn to distinguish and give value judgments to our actions and different aspects of ourselves. Somewhere, both between and encompassing our pure innocence and acknowledgment of the other, is our true self, and the place that we spend the totality of our mortal lives trying to reach. Who are we, and where do we come from? Those eternal, nagging questions that never quite receive an answer, are encompassed by this card.