How to override Datetime formatting or serialization logic?

[santolex]

I'm struggling to find a way to change datetime format when logs are exported with OpenTelemetry.Exporter.OpenTelemetryProtocol.
what i found so far is that all types besides numbers, strings, chars are converted to string using InvariantCulture and i didn't find any way to override this logic, like providing custom IFormatProvider or type specific serializer which would convert datetime to unixTs
I log some stuff like this using default ILogger

_logger.LogInformation("Good signal found side:{side} signalTs:{signalT} ", side , dt);

And in Loki dt is exported as MM/dd/yyyy HH:mm:ss which is not granular enough for me.

Any suggestions will be greatly appreciated.