Welcome to the Monastery, ShallTear.

OTLP over HTTP (JSON) is incomplete; the Perl OTLP JSON encoder is not fully compliant.

Are you referring to OpenTelemetry::Exporter::OTLP::Encoder::JSON? This has no open issues and claims compliance with the 1.2.0 version of the OTLP specification. Perhaps the simplest solution is either to raise an issue and await a fix or else contribute the fix yourself?