Welcome to the community @jakub
Yes there certainly is
Both of those goals are very realistic.
I recommend all new students to focus on building out their repertoire as a key priority.
The first tunes that we learn are the hardest and with each new one the process becomes easier and easier. Once you have learnt 20 or so standard/broadway tunes your harmonic horizons will have expanded exponentially and you will feel comfortable with voicings, common progressions, and harmonising melody lines.
The transcription side is very important so itās great that you have an emphasis on that at this stage. Iām sure you have already discovered @Tuomo 's transcription/ear training exercises, but hereās the link just in case:
Start with the ear training exercises and then you can also move onto the full transcription studies which Tuomo has ranked by difficulty here:
https://community.pianogroove.com/t/transcription-exercises-levels-of-difficulty/
Using Tuomoās exercises would be the perfect stepping stone to achieve the goal learning some Stevie Wonder songs by ear.
To start with, try to dedicate at least 15 minutes per day to transcription, and the more time spent here the better in my opinion.
I hope this helps Jakub and if you have any questions with the lessons, courses, or other materials donāt hesitate to let us know.
Cheers,
Hayden