When using ansible-galaxy there is template in the source with (for example) a variable {{ author }}.
But I can’t see a possibility to add these variables to the ansible-galaxy init call.
Is that already possible?
Not currently, but it is a good idea for init to accept those are arguments. I’ll open an internal ticket for us to add that, though the ansible-galaxy command is in the main ansible repository on github if anyone else would want to tackle it.