There are a few programs that let you convert one company's style format to another's, and some of those might include the ability to play the style to an external device in order to "audition" the style, but I have no familiarity with those programs.
Regardless of the specific format that a given company uses, a style file is usually made up of two portions-- a MIDI portion that contains the Note On/Off and other MIDI messages for the style, and a non-MIDI portion that contains additional information in a proprietary format for how the style is supposed to respond when you play different musical keys and chord types.
Sometimes it's possible to simply rename the file extension on the style file to ".MID" and then load the file into your DAW. If this works, it will import the MIDI portion of the file into one or more MIDI tracks, but will ignore the non-MIDI portion that it doesn't understand.
Note that the MIDI portion which does get imported will most likely be for all of the style sections at once, one after the other, usually with a text marker at the beginning of each section to indicate which style section the following MIDI data is for.
Also, the MIDI data will usually be in a specific musical key and chord type, subject to however the given company does things. For example, I know that Yamaha styles are usually written for a C Major 7 chord type, and then the keyboard transposes the chords and phrases of the style to whichever musical key and chord type is being played on the keyboard; but I don't know how Roland does things.
Consequently, you might be able to load one of your Roland style files into your DAW so you can work with the MIDI data in your projects. The way I would probably do it would be to (1) import the file, (2) chop out everything except a specific style section as indicated by the embedded text markers, (3) transpose the MIDI Notes of that section to a specific musical key and chord type, and (4) save that section as a MIDI clip. I would then repeat this process as many times as necessary or desired, until I had a collection of MIDI clips for that style, where each clip corresponded to a specific section of the style being played in a specific musical key and chord type. It would be a bit of work, but the end result would be a collection of MIDI clips that could be imported into your projects as desired, either for one-off playing (such as an introductory passage or ending passage) or for being played in a loop.
Note that since the style file would be programmed to use specific voices or tones or presets-- whatever term the keyboard manufacturer uses to describe the various timbres which are available on its keyboards-- whereas you would presumably be using the DAW's own virtual instruments and plug-in instruments to play the style data, you would want to edit each of these MIDI clips as needed to select whichever presets from whichever virtual instruments you want to use for playing on the various channels within the clips.