Your best chance to get it into Tails, is to have it available in the Debian stable repository first.
If it is not in Debian stable, you're out of luck. Once it is in Debian stable, it's probably still unlikely.
However interest in crypto currencies are increasing. The Monero community is currently working to get their wallet into Debian stable as a means to get a chance to land into Tails as a software installed by default.
btw: once a package is in Debian stable, you can install it into Tails persistence with:
sudo apt-get install package-name
Take in mind that installing additional software can reduce the security of Tails and could even deanonymize you.