The first episode is being shown in japan
From The Lost Media Wiki
I found a website that states that for an event, they will show episodes of various NHK children shows, inducing the first episode of bakeruno shogakko hyudoro gumi. The event starts on the 21st of April to the 14th of may. https://www.bpcj.or.jp/event/blog/2023/04/post20230331.html