Waaaay too early to be thinking about that.
Keep in mind that few people want to be chiefs at major airlines and even fewer get the opportunity.
They are almost always Captains, but there are exceptions for assistant chiefs.
Their resumes *usually* have extensive training and management experience.
Military officers usually come with that background.
Civilians *typically* have been instructors at multiple airlines. To get to be CP at a major you WILL need management experience, either military, at a regional, or at the legacy. You're going to need to build your resume along the way to even have a shot at that.
Get an MBA. At this point you want to be building instructor experience to make you more competitive for the training dept at the regional. Volunteer for training and any management-related jobs.
I don't see any of that happening without CFI experience, and ideally leadership experience at the flight school.
Once you have a credible resume, it's all about politics. Such as being in a key union position and "cooperating" with the company.
But all told it's a very long shot, something to do if it becomes available but probably not something you want to chase to hard. Too likely to be disappointed.