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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.
Moola Nakshatra - It is a nakshatra of research, digging deep and knowing the hidden truth of things and people in life. For more information on Moola Nakshatra, please read this - https://www.astrosaxena.com/Moolnaksh .
Sagittarius - As Moola is part of Sagittarius sign, Sagittarius and things represented by Sagittarius are important here. Sagittarius is the 9th sign of Zodiac Belt, hence it represents many things related with the 9th house of horoscope like Religion, Knowledge, Wisdom, Higher Learnings, Gurus, Teachings from your Father etc. Besides it also represents Coaching, Universities, Professors and Preachers, Higher Wisdom, Written Law of the Land etc. Sagittarius has 2 and half nakshatra which are Mula, Purva-Ashadha and Uttara-Ashadha. Sagittarius' lord is Jupiter.
Ketu - As Ketu rules Moola, Ketu's position and dignity is important to know about the overall functioning of any planet in Moola.
Jupiter - As Jupiter rules Sagittarius, their position and dignity is important to know about the overall functioning of any planet in Moola/Sagittarius.
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 Moola Nakshatra – Here, Jupiter is in own sign and in Ketu's nakshatra. So dignity-wise, we can say that Jupiter is strongly placed in own sign. Normally Moola is connected with occult, mystical or spiritual side of life, so one generic interpretation of Jupiter in Moola can be someone who is a guide or counselor in occult or spiritual domain. But Moola is represented by roots and it represents any kind of research work. So, Jupiter in Moola can show a person who is all about gaining more and more information through research oriented activities and then he would like to share that information or knowledge with others. Now, it can be any type of research, i.e. medical, technical, financial or as we discussed, the occult/spiritual side of it. As Jupiter is in own sign here which is sign of guides and counselors, it shows that these people can be research scholars and teachers.
At the same time, Moola has representation of uprooting something and planting it back again. This looks like a normal process but think of a plant which is uprooted from a land and then again placed on another piece of land. This is a very transformative process for that plant. This means that in matters of Jupiter related things, this person can go through some major transformations in life. It means that he can see major changes in his family, married life, with children or even in his source of wealth. This also shows that person's belief system, religious faith and spiritual values can go through a major change. Jupiter-Ketu energy exchange can bring impacts of Guru Chandal Yoga where person may not follow any organized religion. So, this placement can still bring troubles in personal life but for knowledge sharing career, it can be a very good placement.
Role of Ketu – Ketu placement is important to guide Jupiter in right direction, being Moola's lord.
Role of Jupiter - As we are trying to interpret Jupiter only, we need not to see Jupiter's placement separately as Sagittarius 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 Moola. 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 Moola can work in a chart.