Using Light and Dark Images in picture-elements

Good day! I am trying to use an Image_entity element in a picture-elements card. I have both a light and a dark version available, but I do not have the ability to pull the URL for these images as they are objects in the Rivian integration. I see in the card that there is a dark-mode-image config, but it requires a URL (like the image config). There is not a “dark” version of the image_entity and after hours of searching and investigating I have been left empty handed in finding an answer. Does anyone have any input or ideas on how this could be solved? Any advice or input is greatly appreciated. Thanks!

The config:

type: picture-elements
elements:
  - type: state-label
    style:
      left: 63px
      top: 40px
      font-size: 30px
    entity: sensor.r1t_speed
    tap_action:
      action: none
    hold_action:
      action: none
  - type: state-label
    entity: sensor.rivian_gear_selector_short
    style:
      right: 5px
      top: 40px
      font-size: 40px
  - type: state-label
    style:
      left: 50%
      top: 40px
      font-size: 40px
    entity: sensor.r1t_bearing
image_entity: image.r1t_in_use_dark