You need to have the MyriadRF module from upstream: https://github.com/myriadrf/pyLMS7002Soapy

git clone https://github.com/myriadrf/pyLMS7002Soapy
cd pyLMS7002Soapy
pipenv shell
python3 setup.py install

For SoapySDR, check https://github.com/pothosware/PothosCore/wiki/Ubuntu or try your luck with https://github.com/sjtoik/vm-setup/blob/master/ubuntu_soapy.sh

SoapySDR and the Pothos project seems to be quite dead though.