How can I standardize font size when importing jpg files

[IslandSchoolBuildingArts]

I am working on a log building book that has a few hundred jpg files, first generated in SketchUp. The graphics are not all the same size, nor do I want them to be templated as different graphics need to be presented in a way that best transfers the information. What I would like to know is if/how I can import these files and keep the dimensioning/leader text at exactly (or even roughly, but not too rough) 7pt font. Is this possible? I've been working on the graphics in Illustrator (using some standard sized artboards), but when I import the file into InDesign, it sometimes needs to be scaled to fit. I would appreciate some experienced input on this. Thanks so much