A few points:
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Player Led (DV-LL) (aka lldv) is effectively HDR video under the hood just not flagged as such.
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You can Load an EDID into CE the EDID can have a DV-LL Dolby Vision VSVDB in it to make CE think the display is DV-LL - details in the thread Jonke mentioned - have a look at this post I made to see if that makes sense regarding the save and load and manipulation: EDID Override - Injecting a Dolby VSVDB Block - #21 by cpm, then use the spreadsheet to create a VSVDB Payload with DV-LL. Note there are caveats around EDID loading and keeping it loaded - more details later in the thread. (Once the EDID is loaded you can then still again override the Dolby VSVDB block from the EDID direct in the CE UI but it needs one in the EDID to start with to indicate it has DV-LL.)
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For Player Led (HDR) the code is hard coded (as shown in the link below), it would be possible to build more in the UI to override these as well (if there was a good case for doing such) - maybe a challenge for someone to take on, but a little unknown if past this point the linux-amlogic changes these values again or will then just pass out the HDMI as is - so would need experiment as well.