So assumption that Sumire has same feelings as Kawaki is considered Love is clearly an inaccurate (explicit) opinion.
Aunt Boruto view, namely Hanabi Hyuga at beginning of being a teacher in team 15, she saw Sumire Kakei as a familiar figure, because Sumire looks similar to Hinata.
Also, after appearance of NUE and breaking of seal on Sumire back, skip to Toneri Otsutsuki and she talks about Jougan Boruto.
It is known that an Otsutsuki can predict future, so it could be that Toneri knows that Sumire is Boruto soul mate.
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