[Feature Request] Add support for Display latency or PC latency (not talking about frametime latency)

I've gone through whole readme but couldn't find any info on measuring latency in games. On Windows there are many utilities that report latency like Nvidia FrameView, Nvidia App and Intel's presentmon. On linux I couldn't find any utility including mangohud that reports latency. Here is a screenshot of a game running on Windows 11 with Intel presentmon reporting Display latency and PC latency.

I did find someone else's fork of manghud which do have custom metrics support, have a look at here https://github.com/ishitatsuyuki/MangoHud/compare/flightlessmango%3AMangoHud%3Amaster...custom-metrics

I also found another project which uses VK_EXT_present_timing extension to measure metrics, have a look at here https://github.com/Themaister/pyrofling/tree/master/latency-measurement-layer

Can any these projects be included in mangohud to report PC and Display latency?