In my experience there doesn't seem to be a standard process or criteria for such selection in individual hospitals policies... the latest guidance from the WHO seems to offer some elements though, but it's very new, so I am not sure how many hospitals already started to use and apply it https://www.who.int/news-room/detail/17-04-2019-who-releases-first-guideline-on-digital-health-interventions
This mHealth assessment tool is an example of what the WHO guidance offers https://apps.who.int/iris/bitstream/handle/10665/185238/9789241509510_eng.pdf?sequence=1