You don't.

Mainstream news outlets almost never describe leaders as far left.

You brought up Brazil. Lets look at Brazil as framed by New York Times https://www.nytimes.com/2022/10/30/world/americas/lula-elect...

"Brazilians voted out their far-right leader, Jair Bolsonaro, after a single term and replaced him with former President Luiz Inácio Lula da Silva."

Ok, if you are specifically reading New York Times articles about Lula, I guess you haven't seen him described as far-left. Of course you will find that term in many other NYT articles (https://www.nytimes.com/2019/11/30/world/europe/spain-podemo..., https://www.nytimes.com/2015/03/11/world/in-spain-rapid-rise..., https://www.nytimes.com/2022/03/26/world/europe/melenchon-fr..., etc.)

I guess I was wrong about Brazil, it seems like Lula's politics can't really accurately be described as far-left based on his leadership during his first presidency.

Notice in all the articles you linked to none of the leaders are referred to as "far left leader" but in one of the articles (last one) "far right leader" is used. Same with the article it linked to with Bolsonaro and Lulu.

Sometimes NYT and other mainstream news will say leader of far-left party, but very very rarely will they say the leader is far left. It seems they use "far right leader" more than 10x they use "far left leader"

Far right leader: https://www.nytimes.com/search?dropmab=false&query=%22far%20...

Far left leader:https://www.nytimes.com/search?dropmab=false&query=%22far%20...

Not sure why you are concluding Lula's politics can't be accurately described as far-left, just because NYT won't print that. Not saying its correct or not but NYT isn't 'gospel'

(As yes I do realize the original article doesn't use specifically use "far-right leader" Meloni. The point is many reporters love to tag people they don't like as far right)