We have a built in Github Issues Pod that could import existing issues into Dendron and also update the imported issues. Unfortunately there is no export pod that will directly submit a github issue yet.
I would imagine this would need to go through Github's API if we don't want to skip the step of copying the asset to clipboard and pasting them in the browser so it gets uploaded to GH before submitting.
@User Do we have plans to add support for github issue exporting?