Doulos SIL Cipher font uses hyphen-minus to indicate extend duration of the preceding note by an entire quarter note for Jianpu notations. However this looks relatively shorter, which could cause some inconsistencies such as imbalanced line length or some positions shifted.
Many Jianpu notations published in China commonly uses even longer dash for this purpose. See these samples.
https://m.jianpu2.com/jianpu/jianpudaquan/214513.html
https://www.everyonepiano.cn/Piano-1682.html
https://www.everyonepiano.cn/Number-5850.html
I suggest adding figure dash (U+2012) for proper appearance.
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