Dear @Kelli Cristina ,
yes you can. "0,5" as the value for story points can be set in Jira Software Cloud.
Apart from the technical feasibility I cannot recommend to start at 0,5. The minimum for one team should be "1". If you have identified stories, that are half of a "1" story, then adjust your scale. The 0,5 will be you new "1".
The reason behind this practice is to give the smallest "something" of a story a 1, the simplest number after the "0". Simple enough for everybody to understand how much is behind this story when implemented.
But anyhow, this is a recommendation. If the team is fine with numbers between 0 and 1, go with them, as long as they are successful. But don't do this with beginners ...
So long
Thomas
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