Let’s look at important things here –
Jupiter - It is the most benefic planet and it represents all the auspicious things like Knowledge, Wisdom, Law, Guru, Spirituality, Religion, Philosophy, Literature, Elderly People and Children etc. For a girl, Jupiter also represents Husband.
Bharani – Bharani is nakshatra of death and re-birth, occult/hidden side of life and instabilities. This nakshatra is also connected with sexuality and attraction. As it is ruled by Venus, the significance of wealth, finance and creativity naturally comes to this nakshatra. For detailed information on Bharani Nakshatra, please check this link -https://www.astrosaxena.com/Bharanaksh .
Aries – As Bharani is part of Aries, Aries sign and its representations become important here. Aries is the 1st sign of zodiac belt, so it represents the things and energy of 1st house of horoscope like Self, Personality etc. Besides that, Aries is the sign of our individuality, our aggression, our actions, our competitive ability etc. Aries is ruled by Mars and it is consisted of 2 and half Nakshatras named Ashwini, Bharani and Krittika.
Mars – As Mars rules Aries, Mars’ position and dignity is important to know about the overall functioning of any planet in Aries.
Venus – Likewise as Venus rules Bharani, Venus's position and dignity is important to know about the overall functioning of any planet in Bharani.
Houses Involved – Also, we can’t afford to forget the houses involved as a planet can be ruling different houses and sitting in different house for every person as per ascendant and planet’s position. To know overall affect, we have to consider the houses involved as those areas of life are being impacted.
Interpretation of Jupiter in Bharani Nakshatra – Here, Jupiter is in friendly sign and in nakshatra of enemy. So, it is mixed dignity for Jupiter. As Jupiter is all about knowledge and Bharani is all about dark occult side of life, this position can make someone a master occultist. They can be good with all type of occult practices. They can be highly interested in theories of life, death and reincarnation. They can be teachers or counsellors in this field. Otherwise also, they can be mostly seen in research oriented work and serving people through that research. Surgeons can also be seen from this position.
At the same time, as Bharani is nakshatra of death and re-birth, their married life can go through many changes or ups/downs. As Bharani is directly connected with Sex due to its symbolism, these people can have high sex drive as Jupiter expands things.
Role of Mars – Mars's placement is important to guide Jupiter in right direction, being Aries's lord.
Role of Venus – Likewise, Venus's placement is important to guide Jupiter in right direction, being Bharani's lord.
Other Factors – And of course, we need to consider conjunction, aspects, house lordship, house position and dashas etc to know the exact results of Jupiter in Bharani. So, we always need to take a holistic view of chart rather than just 1 planetary position.
Conclusion – So, this is how I see Jupiter in Bharani can work in a chart.