Yes, formal training is necessary to be a clinician.  The formal training will revolve on clinical pedagogy and methodology as well as current practices on clinical studies.

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See Sec. 14 of the Rule re: Effectivity – 

This rule shall take effect at the start of Academic Year 2020-2021 following its publication in two (2) newspapers of general circulation. The requirements under second paragraph of Section 5, Rule 138 as amended by A.M. No. 19-03-24-SC dated June 25, 2019 shall apply to bar examination applicants commencing the 2023 bar examinations.

Please read in rn relation to LEBMO No. 23