Hey Federico! Thanks for reaching out. It's currently not possible to do this via the native integration, because the subsequence option is a feature that only becomes visible in Smartlead after a campaign has been launched (specific to that campaign), based on specific conditions for leads in that campaign.
Here's a quick guide explaining how this works in Smartlead: https://www.youtube.com/watch?v=s1U_ncY5fWE
Let me know if you have any questions.