QSpectrumAnalyzer ( https://github.com/xmikos/qspectrumanalyzer ) using soapy_power ( https://github.com/xmikos/soapy_power ) might work, I personally have not tried. One possible problem is that neither repository have been updated in 3 years, (one has 45 issues and 2 outstanding pull requests the other has 12 issues and 8 outstanding pull requests), that is usually not a good sign.
I’ll point you towards this thread QSpectrumAnalyzer now works with LimeSDR! by the author of the QSpectrum Analyzer application.