I've Never Seen a Saint who can use Magic so Well - Chapter 123

Anyone who could construct a stable Spell Model could become a Wizard — that was the Wizards’ ultimate secret! Having been given a new life as the son of an aristocrat and armed with a super quantum computer from his past life, Spell Models came as easily as breathing to Merlin. With this overwhelmingly huge advantage, would Merlin become the greatest Grand Wizard of all time?

One moment, Lucas closed his eyes to sleep. The next, he opened them to find himself not in his bedroom, but in a courtroom.Even more startling, he was in a different body.Lucas was confused, but there was no time to dwell on it.Why?Because....“Your Honour, please sentence him to death!”the prosecutor demanded, looking directly at Lucas, who was seated on the judge's bench.'It seems I have become a judge.' Lucas realized.

A 20-year-old genius medical student transmigrated to a book she read during an experiment and became a female supporting character named Mo Li.

…but it seems pretty doable.