Enable full-text search for non-std file types (like .json files) in Sharepoint in Microsoft 365

If I have a .json text file in a Sharepoint document library, Sharepoint in Microsoft 365 can't find results when searching for a phrase in the file.  When I upload the same file but with a .txt file extension, allow time for it to be indexed, Sharepoint can find *that* .txt file when searching for the phrase within the file.  I want Sharepoint to index .json files the same as it indexes .txt files.  How can I associate any given file extension as a Text file capable of being full-texted indexed like .txt is?  I'm imaging of list of file extensions somewhere, where I can add .json, but can't find anything like that.