This article describes how DaVinci Resolve (version 18.1) writes HDR10 static metadata into Dolby Vision metadata (L 6) when exporting a Dolby Vision IMF.  
 

Level 6 metadata serves as a placeholder for HDR10 static metadata values MaxCLL - Maximum Content Light Level and MaxFALL - Maximum Frame Average Light Level.

MaxFALL/MaxCLL are not not calculated as part of the Dolby Vision metadata creation process. Therefore, Dolby Vision metadata exported from a Dolby Vision analyzed timeline will not contain HDR10 metadata stored in L6. Likewise, when exporting a Dolby Vision IMF package from a timeline with imported Dolby Vision metadata that does not contain HDR10 metadata values stored in L6, Resolve will not calculate them or include them in the Dolby Vision metadata of the exported IMF package.

However, when exporting a Dolby Vision IMF package from a timeline that has been analyzed with Dolby Vision, Resolve will calculate and insert static HDR10 metadata values as Level 6 in the Dolby Vision metadata. For HDR10 metadata values to be calculated and exported as L6 in the Dolby Vision metadata, you must export the Dolby Vision IMF package from an analyzed Dolby Vision timeline.