Dissection of BLE audio services and profiles

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Are there are any plans for implementing dissectors

No, there are no plans for implementing dissectors.

Any dissectors.

As Wireshark's non-crowdsourced FAQ (as opposed to the crowdsourced FAQ that the Wireshark Q&A site is) says:

Are there any plans to support {your favorite protocol}?

Support for particular protocols is added to Wireshark as a result of people contributing that support; no formal plans for adding support for particular protocols in particular future releases exist.

so don't look for plans; Wireshark is a volunteer project, like many free-software projects, and if nobody volunteers, it doesn't happen.

Or is the expectation that these dissectors will be contributed by other developers to Wireshark over time?

The expectation is that, if somebody needs such a dissector, they'll write it and, hopefully, contribute it to Wireshark, so that it will show up in a future release.