In the Rahula Samyutta, the word 'Dhamma' refers the teachings of 'ultimate or higher truth' (lokuttara dhamma), which lead to developing the Noble Eightfold Path & enlightenment. As stated:
Venerable sir, it would be good if the Blessed One would teach me the Dhamma in brief, so that, having heard the Dhamma from the Blessed One, I might dwell alone, withdrawn, diligent, ardent and resolute.
In response, the Buddha teaches Rahula about impermanence, unsatisfactoriness & not-self, which is a teaching leading to Nibbana (rather than mere mundane teachings about kamma & 'rebirth', which are not 'Dhamma' with a capital 'D').
The Pali is: "bhagavā saṃkhittena dhammaṃ desetu"; if searched at: https://suttacentral.net/, will probably find wherever this phrase is used, the outcome of the suttas found (see link) is Nibbana or enlightenment. This shows the word 'Dhamma' in the contexts means 'higher truth' rather than 'phenomena' or 'mind object'.
This is the right or proper way to study Buddhism, namely, examining how a word is used in the context of the various suttas.
Using dictionaries & ordinary scholar explanations is the wrong way to study Buddhism, causing lifelong confusion. Dictionaries & commentators is 2,400 years of the blind leading the blind.