I was reading this answer, where the author of the answer Keshav Srinivasan speculated that Rishi Jaimini was totally in agreement with Vedanta School, but was pretending to have views like that of Purva Mimansa School.
If that is true then as we know from Mahabharata that Rishi Jaimini was present during the time of Mahabharata war on the battlefield of Kurukshetra surrounding Shri Bhishma on the bed of arrows.
Vaisampayana said, 'Listen, O king, with pure heart and concentrated attention, as to how, O tiger among the Kurus, the high-souled Bhishma cast off his body. As soon as the Sun, passing the solstitial point, entered in his northerly course, Bhishma, with concentrated attention, caused his soul (as connected with and independent of the body) to enter his soul (in its independent and absolute state). Surrounded by many foremost of Brahmanas, that hero, his body pierced with innumerable arrows, blazed forth in great beauty like Surya himself with his innumerable rays. Surrounded by Vyasa conversant with the Vedas by the celestial Rishi Narada, by Devasthana, by Asmaka Sumantu, by Jaimini, by the high-souled Paila, by Sandilya, by Devarata, by Maitreya of great intelligence, by Asita and Vasishtha and the high-souled Kausika, by Harita and Lomasa and Atri's son of great intelligence, by Vrihaspati and Sukra and the great sage Chyavana, by Sanatkumara and Kapila and Valmiki and Tumvuru and Kuru, by Maudgalya and Rama of Bhrigu's race, and the great sage Trinavindu, by Pippalada and Vayu and Samvarta and Pulaha and Katha, by Kasyapa and Pulastya and Kratu and Daksha and Parasara, by Marichi and Angiras and Kasmya and Gautama and the sage Galava, by Dhaumya and Vibhanda and Mandavya and Dhaumra and Krishnanubhautika, by Uluka, that foremost of Brahmanas and the great sage Markandeya, by Bhaskari and Purana and Krishna and Suta,--that foremost of virtuous persons, surrounded by these and many other highly-blessed sages of great souls and possessed of faith and self-restraint and tranquillity of mind, the Kuru hero looked like the Moon in the midst of the planets and the stars. Stretched on his bed of arrows, that tiger among men, Bhishma, with pure heart and joined palms, thought of Krishna in mind, word, and act.
Then it is obvious that he knew about Krishna and he had seen Krishna, so what were his views on Krishna? Did Rishi Jaimini had knowledge that Krishna is an incarnation of Shriman Narayana and that he is Brahman?
A point to be noted, according to Rishi Jaimini and Purva Mimansa thinks Brahman is not the material, substantial cause of Universe rather Brahman is a powerful eternal being.
After reading this from Skanda Purana it appears that according to Rishi Jaimini Shriman Narayana is all powerful and omnipotent aka Brahman.