There are plenty of areas for crossover UX between hardware and software, especially if you were designing any type of electronics. A car radio that has a combinations of screen + buttons is an obvious example. You could always work on some free time projects like that which incorporate a bit of both.
Requirements for UX jobs tend to be like entry level ID jobs which insist you must be a master of manufacturing, CAD, rendering, sketching, rapid prototyping, hand modeling, human factors, design research, yadda yadda.
HTML/CSS coding is honestly incredibly basic, and is something you could teach yourself - I learned HTML when I was ~12 and these days there are so many frameworks understanding the basic structure and relationship isn’t hard. You can make yourself a new portfolio page for fun.
The understanding of code is useful the same way the understanding of injection molding is useful for ID. You need to have some semblance of what the practical constraints are to properly design a good solution - especially in todays world of websites which are responsive for mobile/tablet/desktop.
Agile/Lean/Scrum are all just more process words that people will throw on anything. Really all that means is “have you worked with an engineering team”. For an entry/junior position that wouldn’t be expected.
The basic skills of wireframing, prototyping, and some basic understanding of visual design are whats most important.