Is there a way to link my steam gaijin account with my other gaijin account?

So, ive been playing crossout for a bit of time lately, and i just remembered to pick up a promo pack, so i go ahead to log in, and i forgot that i have to log in from steam for crossout, I ask this because i have been playing crossout on my steam account, and have a lot of progress on my official account , where ive been playing war thunder. Is there a way to merge them?