Initializing empty field and assigning field in same constructor

I have a class that manages access to a football API. The class has a field called season which represents the current season of play as a string. Tu update this I have a method to re-assign the season-field, which is my getCurrentSeason()-method.

I need access to season, but would also like to set the value of season in the constructor to have a value as soon as I initialize my ApiManager. I saw it was possible to call this.getCurrentSeason() from a similar piece of code, but season remains an empty string in my case.

Through debugging, I can see that the API call comes through and gives access to the necessary information. I was thinking of just returning the season in getCurrentSeason() so I could call this.season = getCurrentSeason() in the constructor instead, but I would still like to be able to call the method elsewhere to update the fields of my ApiManager, so I would like to avoid this approach.

Code below. Any help is appreciated.

import fetch from 'node-fetch';

export class ApiManager {
    constructor() {
        this.season = '';
        this.options = {
            method: 'GET',
            headers: {
              ... // API key removed
            }
          };
        this.getCurrentSeason();
    }

    async getCurrentSeason() {
        const url = 'https://api-football-v1.p.rapidapi.com/v3/leagues?id=39&current=true';
        try {
            let response = await fetch(url, this.options);
            let json = await response.json();
            this.season = json['response'][0]['seasons'][0]['year'];
        } catch (error) {
            console.log("Error: " + error);
        }
    
    }
}