Is it allowed to add custom namespace/tags for specific project?

I read the wiki pages about the tags and good practices, but still haven’t understood if adding custom tags is allowed. We are working on mapping the cycle network for a region in Switzerland. The authorities would like to promote some roads but it is not possible based on the current tags. Some unpaved ways need to be included but not all and the quality of the road cannot be used as criterion. Is it allowed to add custom tags in a specific namespace like bern_mobility_map: cycle-only on some elements of OSM?

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