I'm also a lawyer. From my colleagues' point of view, even if some of them know something about taxation and accounting, they are only superficial, which is normal. After all, lawyers' main energy is law and related litigation practice, so it is very difficult to make lawyers' financial and taxation level surpass that of accountants and tax agents.
However, don't worry, if the lawsuit reaches the court, will the judge know about taxation and finance? Their cases are broader than lawyers.
If the company can find qualified accountants or tax agents in finance, it can contact specialized accounting firms and tax agents, who can provide corresponding suggestions and analysis from a technical point of view, combined with lawyers' legal knowledge and practical experience, which should be operable.
Just as lawyers who specialize in medical disputes cannot surpass doctors in medical level, they can still operate.