I was stuck on this for the past 4 hours.. but now found out the solution is
${content.spacer?string}
For future references, hope this also helps others (maybe handy to add this to
this documentation:
https://documentation.magnolia-cms.com/display/DOCS/Option+group+field
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Context is everything:
http://forum.magnolia-cms.com/forum/thread.html?threadId=db0c59f4-0362-4350-804a-582d8e4855d9
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