Since 2014, I have been involved with several projects with a goal to convert an existing application to utilize a microservice equipped with a RESTful API. In every case, the desire was to allow a client to make RESTful API calls (as needed) to the microservice for retrieval, persistence and other data processing needs.
I fully believe I am not the only one who has ventured down this course. In fact, in a personal adventure, I did the very same thing for my mother-in-law as documented in my "New Application Journey" series.