Installation on the PinePhone was supported by Wibble from the Pine64 forum:

https://forum.pine64.org/showthread.php?tid=16614

May these people join us:

For support for LibreOffice on the PinePhone we can ask questions also here:

https://ask.libreoffice.org/t/how-to-install-libreoffice-on-the-linux-pinephone/78115