Hi Pinoq,
Here's the steps:
1) You have to enable versions on your list setting via SharePoint.
2) Add "When an item is created or modified" as a trigger
3) Add Initialize variable, name it "version"
set it to integer / set the formula : int(triggerBody()?['{VersionNumber}'])

4) Add "Initialize variable" again and set it to String/ formula : add(variables('version'),-1)
and add ".0" to last of the value

5) Add "Send an HTTP request to SharePoint"
URI : _api/web/lists/GetByTitle('<Your list name>')/Items(@{triggerBody()?['ID']})/Versions

6) Save the flow and do Test
7) Copy whole "Body" in the output of "Send an HTTP Request to Sharepoint"

8 ) Get back to the flow editing page
9) Add "Parse JSON", input "Body" from "Send an HTTP...." with dynamic content
Click "Generate from sample" and paste what you copy in step 7, and click "Done"

10) After this, consist as below

Whole flow construction:
