"how much I value" is correct and usable in written English.
You can use it to express how much something is appreciated or valued. For example: "I can't express how much I value your friendship."
Whether you've been with Borders for a few months or several years, I hope you know how much I value you and all that you've contributed.
I didn't really fully understand what a liberal arts education meant, which is ironic given how much I value it now.
May I say how very lovely you are all looking and how much I value your contribution to the Conservative party.
"It goes without saying how much I value the fans who have supported me so loyally over the years, it has been one of life's singular pleasures to have played this game in front of you.
My father always said, "Consider the source", so whenever I have any criticism, I always analyse who said it, why they said it and how much I value their opinion.
On the opening night of "Sweet Bird of Youth" (1959) — a play that Kazan had to fight to keep the spooked Williams from closing out of town — Williams wrote to Kazan, "Some day you will know how much I value the great things you did with my work, how you lifted it above its measure by your great gift".
"Before the trip, I considered myself quite independent, but I realised how much I valued interacting and enjoying experiences with people.
At the party, he led a shout of "f you, Chevy" to, as he states in an email, "let the cast and crew know how much I valued their patience and professionalism". At that point, Chase, Jayni and their daughter, Caley, left the party.
It was all coming down to how much I valued both my science and my relationship, and how I could choose between them...
My tattoo would be simple, a surprise for John, something to show him how much I valued our life together.
I really think God was trying to show me how much I valued and depended on my outward appearance, and how vanity had become my source of strength and confidence.
