Being geared towards the clientele that AppSheet is, since you log in with an external service (GMail, Microsoft, etc), there shouldnโt be (and isnโt) a huge demand for a password type. Because passwords shouldnโt be stored in your appโs database. And for other types, there just wasnโt a huge demand for what is, in all reality, a completely cosmetic addition vs whatever work would go into implementing such a feature.
However, there has seemingly been an uptick in requests/interest in text input masking. I donโt know if theyโll give an option for passwords, but the ones Iโve seen the most requested have been for phone number input.
LinkedIn
Twitter
