character encoding in JSON BOMs

After asking myself whether I need to support any encoding besides UTF-8 when consuming CycloneDX JSON BOMs, I stumbled over https://mobiarch.wordpress.com/2022/12/10/lets-talk-about-json-and-character-encoding/.

With https://github.com/CycloneDX/specification/blob/1.6/schema/bom-1.6.xsd and the XML examples using UTF-8, I wonder whether some downstream users also assume CycloneDX JSON BOMs are always UTF-8 encoded, while [RFC 7159](https://www.rfc-editor.org/rfc/rfc7159#section-8.1) also allows UTF-16 and UTF-32 in LE/BE flavors.

So perhaps it would be good to add a clarifying sentence about expected/recommended/required encodings to https://cyclonedx.org/specification/overview/, wdyt?