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Or, you could leave the lower thirds out of the analysis. This way the text pixels are not included in the metadata analysis, only the video track pixels are used. The mapping is applied to the final composite image (image background and text).
If you leave the subtitles out from analysis, you can adjust them individually (in HDR) and check the mapping immediately without having to decompose and compound. You can adjust each title element individually so that it is rendered to a specific video level in SDR. However, you should then also check how these lower thirds (adjusted in HDR) are rendered on other targets, such as 600 nit and/or 300 nit HDR.