fvtt-data-toolbox VS foundryvtt-importer

Even presuming that an existing import tool (like Data Toolbox) is sufficient for your exact re-import needs and thus work wouldn't need to be done there, building a reliable exporter is unlikely to be substantially easier than just building a tool that does what you're after purely in Foundry.

I've never tested it, but maybe you can do it with the Data Toolbox module and a xml to csv converter.

You can use Data Toolbox module to input data into a compendium from CSV.

"In order to use the service with the TC assets, you need to sign up for the Moulinette Patreon at the Dwarf Miner Tier ($2/mo) https://www.patreon.com/moulinette as well as being at the Adventurer+ (5$) tier on my Patreon."

Available to Moulinette Patreons at the Dwarf Minor Tier ($2/mo) https://www.patreon.com/moulinette

It then generates all of the important elements of the NPC, as well as a stat block that I can automatically insert into my game using my (shameless plug) module foundryvtt-importer.

If you happen to use foundry, you can even use my (shameless plug) module to import the NPC into the game with the stat block foundryvtt-importer.

Install the Content Parser module.

Foundry VTT Content Parser

Link to repo